If you’ve got a desktop, and using sata drives, you could use a SATA Power switch panel. Basically on off switches for drives so you can turn off the Linux drive when booting windows.

Zerotier. They have their own protocol, and there’s a free tier that lets you connect up to ten machines to make a network.

Also possible to selfhost, although I haven’t done it.

Why not get an older desktop and fill it with drives?