Since this isn't going to replace singles, and we are only looking for one winner, how about just make it SBO style?
Also fix the rules because right now something like...
NY vs CA
Zar plays Arlieth, Zar wins.
Zar plays Arlieth, Zar wins.
NY just won two so they advance!
...could happen. No its not what you were thinking but by the rules that could. The thing is whatever the rules are supposed to be can't be determined the way they are. Are teams round robin or elimination style? Does the 2/3 mean each player plays 2/3 or each team plays 2/3? These things need to be addressed and clear. I'd also suggest removing the 2/3ness since it's three people already so it works as a 3/5, just with player changes...assuming elimination style. Round robin style would just take way too long.
There is a lot of time left to decide these things, but the earlier the better, especially if there are major changes like team size and team restrictions.
On the topic of restrictions, players playing for a different region they live in should have a good reason of doing so, like recently moving, or playing with that group more. Keep in mind this is a year to come so people who just recently moved now are going to be in their current area for a year...unless they move again that is. Either some specific guidelines on a no restriction rule or a rule should be said soon though. Something like must have played in an area for two of the last three months to count as part of that area or something.