If turning the band down feels anticlimactic then having them ducked by a compressor will feel about the same, that’s what it’s doing. What might get the effect you want is to just turn down the vocal group (if you’re using one), or just the backing vocals if you have a lot of those.
It can currently be done using outboard if you still have any lying around from the “insert” tab on the mix you want to insert on and you can patch a channel direct out for the sidechain input. You could also use an aux for the sidechain if there are multiple things you want to be able to duck the mix.
Chris