I suppose it’s possible to build a system that would let you specifically allow a VPN IP to be green-listed on your account, but you’d probably have to allow it by signing in from a known good IP first.

I think it seems like lot of work for something that isn’t really private and is still probably vulnerable to exploit.

https://daily.bandcamp.com/features/bandcamp-fridays-update

it’s worth noting that the first friday of each month they usually forgo their cut so more money goes to the artists.