Actually, I believe something like this existed before. It was the old Zoner Alliance (THE OLD ONE, not the new one that Zoner-Trader/Tri_Urdent and Tel Aviv have started). It consisted of the official Zoner factions back then (roughly 3-4 years ago) including the ZTC (which became the Omicroners), OSI and TAZ. Independent Zoners could also join independently. But as far as I know, it apparently fell apart due to constant infighting and lack of consensus. You should ask n00bl3t and Doc Holliday for more information. I used to be part of this back in 4.85 but I left before it broke up.
EDIT: Read the entire first post, nvm delete my comment.