Working (for now...)
I got my non-stock Droid Pro working with both CDMA (verizon) and GSM (t-mobile). As mentioned above, however, the phone can only access one network at a time. I use Netswidget to quickly switch back and forth between the two. Kind of a pain in the rear but still nice to have it working.
Now that that's settled, I am going to attempt to update the software. The version on the phone is 2.26.6. I want to use the 2.26.20 SBF and then hopefully run a OTA update to 2.26.60.
The reason for this is that the DP i have has horrible (unusable) voice quality outgoing through the mic. Wired or bluetooth handsfree works and sounds perfectly. But I am hoping a software update might fix this as I am getting tired of searching for my bluetooth everytime I need to answer the phone.
Wish me luck!