I have four of the bluetooth SN30's for couch co-op games on my SteamDeck. I agree that if I switched between devices often (like my son's switch) I'd need a lookup table for the power-on chording. Mine have the key combinations printed onto the label on the back.

Fwiw, the ones I have remember their last pairing setup, so I only need to power them back on via the "Start" button.