it is a question of “should we do this?” more than “can we do it?”
I will say it again: the popup mechanism is there for special cases, it is not meant as a debug feature.
Seems best to me to take a step back and write what is the purpose of the request.
If we want a bigger display of a knob value is when changed - that is a totally different request (and a valid one). It would be done on a system-level so it applies to all knobs/controls.
Some new option to “allow this plugin to send device popups” seems bad to me, it is yet another option in an already complex system.