@unfa tbh I think that is a tool for something other than carla. it only happens with jack, when carla runs its own patchbay the audio IO is not supposed to go away..
so I think this is a generic issue, not something to carla. and as such, it should be solved in a generic way, not inside carla.
stuff like https://github.com/guysherman/jack-passthrough/ is an option, though it needs something else to actively monitor and connect things when they reappear. surely something for that already exists.