I like the idea.
But yes, as already mentioned, you should be less friendly to the Unioners. They are the main "pirates" around Rheinland while the official Hessians have move towards a more (extreme) revolutionist stance. The LWB just want their jobs as farmers back and Libertonian Megacorporation "Synth Foods" out of Rheinland. While Hessians are rather miners, LWB is mostly focussed on Stuttgart.
You can ASK for donations from everyone, if you let the smaller ones go without any trouble. I think bigger transports can be uhm...pushed a bit into paying.
Anyway, the idea is great, I hope it gets some attention, even though we have already lots of pirates/hostiles in Rheinland and we miss some more defense. (Though the RFP there is often doing a very good job with the TLAGSNET or however it's called.)
But, I'd be interested in something...
If you see a (lone) capital ship (gunboat or cruiser) in northern Hamburg. The ship doesn't seem to notice you or is focussing on something else. He might be flying somewhere or following someone, what would you do?
Another thing, you find a single capital ship (again, cruiser or gunboat) in Frankfurt or Stuttgart, the ship misses some bots and bats, it's seems to be heading towards the next lane but it's still way out. Would you decide to attack it?
If so, what if the captain/crew iRP says he's heading back to the Hamburg front and explains to you, that he was fighting hostile forces?
The question is, would you rather use that situation to destroy a lone warship or would you keep in mind that those might be just soldiers who just fight for their house as they don't want it to be overrun by Liberty?
Would you try use that situation to pull them on your side?