There is also an update for windows 7 that installs a nag screen saying “Your PC uses a processor that isn’t supported on this version of Windows”.
I'm running windows7 on ryzen 7 1700 and am just installing "security only" updates manually. but to be clear, I don't recommend that, just saying.
Your motherboard does have PS/2 inputs for both keyboard and mouse, so you should be ok installing windows 7 should you decide to give it a go.