I expect we’ll do an explicit call for volunteers. Our first step is to directly approach the moderators of the existing platforms, though.
No, this is not something we’ve discussed so far.
Personally, I hope this kind of quota system is unnecessary. While it would certainly be a sign of some kind of imbalance in the system if most moderators were part of the same organization, this outcome can be prevented through the poll mechanism – that is, don’t vote for a moderator team that you do not consider trustworthy. What could be helpful, though, would be a requirement to disclose relevant affiliations (similar to the expectations for working group members).