It's ok that Hessians are told to stay out of the fight in Munich because Hessians generally don't go there anyway. But I don't see how you can just discard two whole factions (Bundschuh, Unioners) completely based on the fact that they and their indies do not sit ingame 24/7. Neither do the RM, neither does any other faction save for the Corsairs, Outcasts and LNS.
If there will be a Corsair fleet heading next to a Bundschuh and Unioner base, those two factions have full rights to make an appearance. They would never sit on their hands and just let this happen, that would be about as OORP as it can get. Just because they don't have your standards of activity does not mean that you can exclude them completely due to issues that are not RP but rather completely OORP and just downright insulting to the factions that are basically being discarded by you. I would say reevaluate your stance.