Thanks Gentlemen! I was hoping that pure-FM could stay in the picture somehow. I'll do some more research (other than Wikipedia and Daniels' P25 training guide) to see if this can be done. I'm not too worried about the "logic" part of it, only if it could be attempted (APCO Phase I equipment has to be dual-mode).
I've also seen Quantar control and wireline boards on eBay for pretty cheap, and if one of those could be interfaced to say a MSR2K or MSF5K that might get things started.
