At this point I would say that discussing and clarifying the idea is the best way ahead; it's early to write policy, which would need a solid idea already fleshed out, to be written in a more formal proposal way.
Thinking about what this could mean, how it could work and how it could help the participants could be a good start. If people get interested, the discussion can go deeper, more detailed.
Words and writing skills, listening skills, diplomacy all would be helpful in a process like this. Specially when it's a proposal to create some liaison between entities that are currently free and fond of their veto/back listing/blocking powers.
But the idea could lead to some good results and create some social links between like minded people and instances. I think it could even be a place for mentoring newer admin and mod staff in future instances which like a particular group's focus and direction.