(I work on rdns)
> ReThink DNS uses the VPN service as well, by the way.
Rethink (since a year ago) has had the ability forward connections per-app to multiple WireGuard upstreams at the same time.
https://old.reddit.com/r/rethinkdns/comments/15r1eq9/v055_mu... / https://archive.md/RqUPe (to us, it turned out to be a deceptively difficult thing to integrate with the rest of the firewall).