Matthew Holder has just created a python program for a RaspberryPi that allows you to control A/V devices like an Extron Crosspoint and even a Sony BVM!!!: https://www.sleepingcats.org/piavswictrl
This software utilizes the SmartPi Touch, for a full touchscreen control interface! You’ll need to make custom USB-to-RS485 adapters and setup seems a bit complicated, but if you have a stationary setup, this might be the ultimate control solution!
Here’s the direct GitHub: https://github.com/6XGate/PiAvSwitchController/wiki
Discussion Forum Topic: https://shmups.system11.org/viewtopic.php?f=6&t=64127