Big thanks to @th3magpi3 ... I've got a 2014 silverado and was able to pick up a 2.5 HMI, newer 2016 radio module and usb port assembly on ebay for under $200. Sent the modules out to him, got them back and plugged them in late last week and all works great with AA. US to Canada shipping took a little while but turnaround time was only a day or two to get them programmed to my VIN and I wasnt in a huge rush anyway. Thanks!!
So far I've tried google maps and Waze navigation as well as pandora and spotify with no issues. As others have reported, no steering wheel audio controls when using AA, sounds like that requires a cluster reprogram- not a real big deal for me to leave as-is... steering wheel audio controls when playing the radio still work when using AA for navigation.