TacticalOni

So I've had a long ponder about this as well, and I even spent some time looking around at available documentation from the F-105G's systems and even got to look through the AGM-78 system as present in the back cockpit of that aircraft to get a feel for what it may actually require to make a weasel airplane in DCS. Here's what I found and potential caveats or solutions. 

1. The RHAW/RWR system on an F-4G
-Caveat: It's super classified and anyone that knows how it works would tell you but then have to kill you.
-Solution?: The HTS pod exists on the F-16C using a single-player "lite" version of the APR-47's logic. You zoom around, you detect radars, the system does some mathing and triangulating, and voila, your solution builds to a degree of accuracy that allows you to fire on it, you pick it out, and Magnum. In my mind you can fudge a fairly decent F-4G just by making an invisible HTS Pod attachment with a goofy little FS2004 2d screen popup that lets you as the player use it. It's not going to make the savant syndrome realism purists happy but nothing ever does. 
I mean, come on, we can work with this:
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2. There exists online a single photo of an IDF Kurnass with an AGM-78 strapped to it.  
-Caveat: the IDF is not super keen to share if its an actual functional weapons system or if they tacked the bad boy onto the pylon to scare the bajeebus out of their neighbors post 1973 and it actually doesn't work. 
-Solution: In the discussions I've had with other people who sincerely despise radar dishes and their associated missile systems, the "throw it on even though it doesn't actually work" idea is the most logical, but there is hearsay anecdotal reports we've found (totally legit) say that the IDF figured out how to make an AGM-78 processor that didn't need any further input from the pilot other than treating it like a Shrike, pointing it at the radiation source, and making 1400lbs disappear from your wing. 
OR
The IDF in the spirit of kitbashing all sorts of stuff from one thing into another (Like the M-51 Sherman, or Sho't Kal, or Tiran) perhaps they fit an AGM-78 panel into the backseater position by ripping out a bunch of stuff they felt the GIB didn't need like the engine instruments or whatnot. This is why I was looking at the F-105G's back cockpit to get an idea of what the system needed to function, and the AGM-78 is a pretty slick piece of kit. 

3. IADS Simulation in DCS is about as deep as a puddle. (Currently)
-Caveat: Well, its a video game, nobody needs to actually know and learn what the PRF of a Fan Song versus a Flat Face is, all we need to simulate is the beam hitting the player's aircraft, locking onto it, and the little bloopydoop sound the RWR makes when that happens, there you go, mission accomplished. 
-Solution: It's a video game, nobody needs to actually know and learn what the real PRF of a Fan Song versus a Flat Face is. All we need to do is provide some numbers that are either guesstimated to a reasonable degree of believability, or completely made up so we aren't selling state secrets.

So with that in mind the question becomes
-What can we make of what we know and already have?
and
-Can we reasonably simulate an F-4G? 

Here's my proposal:
-Using the logic provided by the HTS pod's sheer existence in DCS, it seems one can pretty fairly model the APR-47 into DCS in terms of purely threat detection being projected on a HSI-type display. Instead of having a cursor, one would have to then model in using the Next/Prev switch the 47 system uses to determine which emitter you're looking at. 
Ok, you're looking at a radar. Now what? 
-According to the workflow Starbaby was really kind enough to establish, the EWO/WSO/Bear would then classify the radar based on PRF and frequency, which as I mentioned before are either guesstimated or completely made up so the secret squirrels don't find our nuts. They could also listen in to the radar's raw tones, which is already kind of present in the F-4E's RWR system using (at least a few months/a year ago) the Handoff button, to listen to the tones being emitted by the radar, it wouldn't be a huge leap to me to put together a small soundfile library of raw radar pulses if your WSO is into that kind of celestial music. It's not a requirement, just a nice to have thing. 
-For the AGM-78, you then have to dial that info in using some spur-style thumbwheels on the panel (That's how it is in the F-105G anyway) both PRF and Freq, configuring the system to tell the missile exactly what it's "listening" for, there's some other dials to set the target height and azimuth. A couple of gauges have needles that will point at the emitter so you can verify it's looking at the same thing you are. Then you press TGT-HO, and tell the pilot it's good to go, Magnum. 
-For the HARM you just select the stupid radar, press TGT-HO, and Magnum. At that point the backseater's only job is really to determine what is the biggest threat, verify that threat, and point the missile, then the pilot, at it. 
-From there to finish building an F-4G, you have to put the little diamond marker on the HUD up so the pilot can see it on the glass (which IRL was just a little secondary projector separate from the gunsight) 
-I feel like the APR-47's system in total is actually not too far removed from many systems we already have in DCS, and that the only thing that needs to be done is massaging all those parts into an engaging simulation. 

Part of me wants to think that one could even build Jester to have "phantom panels" that only he can see and operate. He is supposed to be community moddable to a point, so why couldn't there be, perhaps, a "Weasel Script" for Jester that turns him into the APR-47, gives him that capability, and you, as the pilot, just have to follow his guidance like he's a WSO turning knobs and hitting switches. I've brought this up before and was basically told that Jester is not some kind of panopticon and he doesn't have the ability to manipulate switches that aren't actually in the cockpit or magically see and track radars like an RWR can, but an Oni can dream, and I wasn't specifically told no. 

I'm not one of those pie-in-the-sky guys who goes "hurr durr its easy to code why hasn't it happened yet" and I would love to pick up coding myself to try and make it work as a mod or as part of a "Weasel Script" for Jester. I know it would take a fair amount of work and its not easy or maybe even possible. 
But as we get further removed from that level of technology I feel like we are only getting closer to it being a possibility. 

Ah, you have the clickable FC3 cockpits installed. Just disable the mod and restart, that will fix it!