DV is difficult to get working properly on PC, and last time I tried to set up an HTPC I ran into tons of remote control issues and it wasn’t simple enough that I could just hand the remote over to a guest (or my spouse).
2019 Shield has plenty of issues sure, but it still seems like the best option for me, personally.
Agree about disable network on the TV itself.
I think I remember being able to switch to anonymous user with it.