The tone rings actually mount on the "bulb" like end of the half shaft in the newer rear ends. There is no place like it or even the same diameter on the end of an 8 3/4 axle, just a flat flange, PLUS that flange is right up against the axle housing so still, no room for the tone ring. The TCM I bought supplied a tone ring to mount on the output shaft of the transmission.
I spoke with engineers that work in the engine and transmission programming dept at Chrysler and they told me there is no solution that THEY could make happen so I would be very interested in talking to whatever rep you spoke with. I think we might be talking about two different applications here.
I installed an Autometer speedometer.

That pic you posted is cool. That would be an easier swap than what I did for sure, however, all that does is make it easier to install the trans and drive shaft assembly. It does nothing to resolve the computer communication issue.