So it definitely wasn't coincidence that when I changed the BCM model year to 2022 and reset it that the Camera started working and all the buttons showed up.
I figured I'd switch my BCM back to 2019 now that I had the cameras working. As soon as i switched it back, all the camera buttons disappeared and the camera stopped working when I'd put the truck in reverse. I figured I'd try setting the BCM to 2021 and see what happened, still no cameras. The Uconnect has to read the BCM as a 2022 otherwise it won't let the cameras work at all, and even with the BCM set as a 2022, the camera softkeys still don't work, but the truck will at least bring up the cameras when I throw it in reverse.
Also, new problem, I tried to transfer my SXM subscription to the UC5, and the UC5 refuses to accept the subscription signal. Went through all the troubleshooting with SiriusXM, no joy. They're supposed to have an advanced tech call me back to try some other stuff, but I suspect I'm not gonna get anywhere.