Actually my second idea besides Kishiro was creating an Zoner faction based solely on FP9 and FP5 and goods to those two stations and food for Corsairs.
My first step would be getting immunity on piracy from Corsairs Council by delivering xy food a week to Crete and actually doing it. I wouldn't extend the pact I established with Corsairs to any other Zoner faction for start.
You essentially just described OSI. I designed our trade routes (Well I am not finished) around Freeport 10 and Freeport 6 since we moved to the Taus. We have additional routes added to cover our contract with the IMG and some for the Order.
I also added in a route that moves goods to Crete to uphold our past of bringing the Corsairs goods. I read your laws and understand the Elders frown on Corsairs that pirate traders bringing food and other needed goods to Crete; so I expect our runs to Crete to be safe. I however fully expect that a Corsair might pirate an OSI vessel when we are simply moving through Corsair space.
The reason the current Zoner factions share so much is because we are all a tight knit bunch. We help each other out when we can and want to see each other prosper.