Use obs to record the window buddy, it’s a free recording software that does an amazing job. Highly recommend , you can use it to record the stretch window and crop it down too if u chose that. Do a search on google for obs and oculus mirror or check out jabbers vid on obs and the stretched window
Quick update : , within about 10 mins with dcs bios and a few breadboards i have most of it working, i see what u mean now by dcs bios makes it very simple (well basic stuff anyway). Just got to wait on mouser now to deliver my encoders and a few switches i got from amazon. Do you have the part numbers for the 3 and 2 way switches in your setup fella?