You are able to force devices to use a specified DNS. even when they have hard coded DNS in them. Your router/firewall must be able to support redirection of network traffic though.
In the basis you are right. But nowadays a good large USB stick shut be able to handle it fine over a long period. I would recommend to put the cache and temp directory’s on a memory drive. that way you do not constantly stress out the USB.
On the other hand nowadays their are USB cases for M.2 SSDs. this would eliminate the entire problem.
In my case i do not use any sort of glue. I just print straight on the texured or PEI sheet. Never really hat issues. If it does not stick welll, I clean it with dishsoap. Seems to work best after a wile of use.