If you need dedicated hardware: Dell optiplex are plentiful and cheap. If you want remote access look into a pi-kvm. Or look for old low end tower servers which have remote access built in. Eg HP proliant ML10 v2 (I have one of these and use it as a hardware test bench). If you don't need dedicated hardware then just use a VM.
It's impossible to remove all the cruft from windows 10, so you should get LTSC version which has a lot less cruft by default. Buy a key off ebay/bitify/etc.
Finally if you don't need internet, put it on a static IP and block it from the internet in your router.
Buy a key
What is this word, "buy"?
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