If your SOPs require 121.5 on 2 at all times then I would be deselecting that audio below transition.
Every beacon I've ever heard, I've been below transition at the time.
I think the guys that have been found thanks to crews monitoring 121.5 would prefer it if the one person that AerocatS2A works with, makes an effort to check their Com selector before transmitting... only takes 3 weeks to form a habit, and something a lot of us got taught at the PPL stage.