Imagine you have a 32 bit machine that drives something else with a controller board soldered on to the motherboard. Will it be able to run windows 11?

never have I seen anything like that that wasn't an appliance. as in vendor-managed.

so, even if you COULD upgrade to Windows 11 on something, don't, because you'll break it. I can't even think of a good reason to consider it.

if it needs to be on the network, isolate it, and let it do its job. it doesn't need to be fiddled with.

I'd also be having a long conversation with the vendor about using standard expansion interfaces and why soldering to the motherboard is a good way to end my relationship with them as a customer.