A couple more bits of information I came across:
This thread talks about different CAN messages that the evo might need:
https://cartechnology.co.uk/showthread.php?tid=43512
specifically, ID 563 00 00 00 00 FF FF 00 63 in place of an idrive controller
another potentially useful one: 202 FD FF (202 is to control the lighting, but this one might also be to control the fan?)
for flashing if changing the VIN, the latest istep that allows the USB patch method to change FSC codes&certs is 07-2018, which appears to be 4.13.xx psdzdata. I have newer and older psdzdata, am trying to find a good source for 4.13.40 or at least 4.13.14.
Here's a torrent for 4.13.14, but i don't know if there is anyone seeding (and i don't have enough space on my laptop to test...):
https://cartechnology.co.uk/showthread.php?tid=38857