You do know that the R suffix has nothing to do with the refueling configuration?
In short, the R signifies that its a former A-model airframe, equipped with CFM-56/F108 engines.
So what you're asking for is the ability for a MPRS equipped tanker, to perform both types of refueling. Boom and drogue, via the pods.
It cant be done currently. The devs couldn't/wouldn't make the logic to decipher which type of receiver was calling and to then have the AI tanker utilize the proper system.
So, they simply gave us two models, hard coded to work in 1 method each.
And no, you dont want a KC-46A. In fact, the USAF doesn't even want them. Broke and unreliable garbage that is heavily restricted as to what its cleared to refuel and type of mission allowed.