Chuck 'em in the garbage and get something that doesn’t break when you insist on privacy.
Check out pikvm: https://pikvm.org/
There are cheaper knockoffs that run the same software. For example: https://geekworm.com/
Decent older servers (e.g., Dell Poweredge) can be had off of Craigslist/FB Marketplace pretty cheaply (~$300-$400).
Chuck 'em in the garbage and get something that doesn’t break when you insist on privacy.