Just thought I would revive this thread, since I was doing more work on my pit.
Wile working on the TFT screan I was searching for parts. taking apart old CRT screans and such. and found that one of the CRTs had a 5 button input on the front. Looking at the board I found 5 micro PB. So I just cut out the part of the PCB board that I needed and began building a way to mount it to my pit.
For the plastic buttons I gtst needed the right dril biy to dril holes for them to pass thrue the ply wood dash. I used a pice of the same sood to build a temp set up so as not to rewen my good dash. next was testing and wiring the PCB, and mounting it so the PB would line yo with the plastic buttons the pass thrue the dase. took some wood working to get the right hight. Put all the pices together and tested it. Works great. I had two empty spots on my KE-72, So I had to find three more. I got rid of the raido test button, training/weapons switch and the ADF switch as I have never had to use it. I wanted to post a video but my camre died and I dont have any more baterys.