What router do you use? A script that randomly selects from a bunch of WireGuard configs in a folder is not theoretically that difficult.
The big benefit of WireGuard is that it is so simple and reliable that it does not need the complicated nonsense that OpenVPN has built in. You can reliably build custom tools around it. A quick internet search suggests people have come up with an OpenVPN remote-random alternative for many OSes/routers with WireGuard.
To answer your original question, unfortunately I have only used the providers we recommend, but it does sound like IVPN would be a good choice for your situation.
I know some of the community likes Windscribe, although I have some reservations, but you can read about them on the forum at Windscribe and Opinions on Windscribe VPN?.