Maybe for the next season, we should say that teams should have played at least 3 live matches with the required number of players? That avoids any problems similar to Costa Rica where it took them 4 attempts to get the required players (although that would also have stopped Nicaragua from joining, and they have done very well for a team with absolutely no prior experience).
Maybe while the playoffs are going on, we could hold a mini 3 round swiss between any interested teams from Season 1 (by this I mean the 12 non-playoff teams), and the new teams so that they can organise games like they would in Season 2 (although there being slight differences as we are moving to a round-robin e.g. more flexibility in game scheduling).
As you maybe noticed, team Brazil has recently registered a representative for its team.
Brazil would certainly be an excellent candidate team for an enlarged Season 2.
I think we could/should start thinking of some mini-tournament and/or friendly match program for prospective future participants.