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So, here are my thoughts on the tournament:
1) Don't include Chinese players. Simply because there are connection issues and time constraints for playing. Playing a duel with them with extended time limits is possible, but in a multi-sided tournament, matches with them will lead to delays.
2) The tournament format is a round-robin. That is, each team plays every other team.
The scoring system is as follows: 2 points for a general victory, 1 point for a draw, and 0 points for a loss.
In the event of a tie, the results of individual matches are counted using the same scheme.
3) Each team defines its own rules. That is, the game version, templates, additional rules, etc.
In a match between teams, 4 games are played according to one set of rules and 4 games according to another.
4) The team roster can be announced, or it can be kept secret – any player from a specific team can play in each individual game.
The main thing is that there should be no games where one player plays for different teams, and also no repetitions – two games with the same player in one match.
5) Each team appoints a coordinator who ensures communication with the players and coordinates the roster for the match.
6) In the event of controversial situations, the final decision is made by a direct vote among the coordinators. As I understand it, there will be an odd number of teams – 5.