The problem with your suggestion is the lack of players. It's sometimes rather difficult to find a person for a 1v1 RT game with a new template, filling a 3v3 on new settings is almost impossible. Everything is in QM.
This only leaves Multi-Day
arenas, ask the CLOT guys for that (
https://discord.gg/NhqWedmb).
Though a friendly reminder, I made a Ladder with just FB on it and got like... 8 players on its peak.
Edited 6/20/2022 08:10:50