I can't think of anything I dive with that isn't capable of being clipped off on its own. All lights, camera rig, dsmb and reel, etc. Each critical piece of equipment should have a bolt snap affixed and clipped somewhere whether that is clipped inside the can or to your harness/bcd once in the surface and using it. If everything is importance is attached to the lid which is also attached to you then the only potential loss at that time is the can and really, who cares. Seconds don't matter in that situation, critical thinking does.
Unclip the plb from the lid and attach to you directly.
Unclip and attach and other needed items after that.
Close the can if still available and stow.
Activate plb and start working out the rest of your self rescue plan.