Just wanted to update my earlier rant: everything is working fine now. I have a UAQ that I bought new, along with a media hub out of a boneyard Chrysler 200s (thanks to the national backorder on that hub: though the parts puller kinda buggered the edges up pulling it from the console of the 200s), and given some time/restarts of the truck, along with correcting a fuse issue, and now I've got everything working right. Both Android Auto AND Apple CarPlay are functional on the left (facing it) USB port, and I have my AAWireless unit plugged in there and working fine now. I'm expecting my heated seats/wheel functions to come back by morning (I pulled the Radio fuse by the brake booster while messing around with the USB hub and fuses in the PDC). I also made the change in AlfaOBD to set the media hub to read as 2 USB/Aux vice the original USB/SD/Aux. Final update of parts used:
New UAQ: 68331631AM
Used hub out of a 2017 Chrysler 200s: 68283703AA
Hub harness from KAOdTech
Weird note: per the Owner's Manual (both paper and digital for my 2015 2500), the USB fuse on my truck was supposedly F65 and F67 is listed as Bluetooth/Hands Free Module. But in my truck, F65 is just a spare port, and the F67 fuse was necessary to make the USB hub work. Just a strange thing to look out for if you're working with a media hub that doesn't seem to want to play nicely.
Last thing: I have a Compass hub (with a single USB port/Aux Port, PN: 5XG28DX9AC) handy if someone needs one. PM if you need/want it!