Around last year I was using some custom plugins for OBS, I haven't used Broadcast Box but I can pick it up to try sometime later.

> If that is still too heavy, what could I do to make it better?

I haven't picked it up yet to see whether it's complex enough to really need it but it has the same pain point a few priors did--being yet another service which I must configure via the browser and so it has to run an entire frontend for doing that rather than being able to do config files.