I finally have a little time to get this going again. I ordered the "MES Central locks with Avital 3100 Alarm" kit and hope to install in the next week or so.
https://www.a1electric.com/Merchant2...Code=W02F-740T
It's a 4-lock kit, so I hope to use for all 3 door on my '72 Suburban, and possibly get the rear door in on fun as well. If I'm able to get this to work, it will require some trickery since the rear door doesn't have an internal handle or knob to pull. I hope to fix that before adding the power lock component.
If I can't get that to work, I'll be pretty happy with power locks on the 3 'regular' doors.