I think the way this is being implemented will be really messy and inconvenient.
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Players who just started need to make a brand new Steam account if they want to play on the boosted temporary servers. You should avoid this inconvenience for at least those players. I think doing it the same way as when the Klai/Orsha and Telsiai/Varena merges occurred would be a good idea. Otherwise, let us have a team name on both same region servers and let us choose which lodge we want to keep when the servers are merged (or automate the process with the lodge with highest team lvl being preserved). That way, old players can help new players in the temporary servers if they want to and new players who recently started can reroll their characters on the temporary servers without needing a new Steam account.
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The game’'s economy revolves around blessed shards and gems and it can be potentially destroyed once the boosted characters are transferred to the original servers. You should make it so that all blessed shards and gems in possession are deleted before the characters are transferred, which would encourage players to spend them (they have a huge discount on transcendence costs after all) while discouraging those who want to abuse the blessed shard drop rates.