I would check the mice that are compatible with Piper. I believe Logitech have a MMO style mouse with 12ish side buttons on the support list but I would need to double check.

With that said, Logitech have been known to use shitty mice switches in some of their G series mice. I had to resolder my G903 buttons, though I took the opportunity to make other modifications (larger battery + glass skates). I don’t believe these mice support Bluetooth simultaneously with their proprietary 2.4 protocol either, so that might be a bit of a deal breaker, though I personally am not too keen on BT for wireless peripherals.