You are right, but it’s not very difficult: The trigger can be “Double-click Main Menubar” and the action “Show / Hide Menu Bar Icons left of the BTT Icon.” Y

You are right, but it’s not very difficult: The trigger can be “Double-click Main Menubar” and the action “Show / Hide Menu Bar Icons left of the BTT Icon.” You can even add actions to hide them again after a certain number of seconds or minutes. (It’s only a partial replication because Bartender can show you the additional icons in a secondary bar, if needed).