Not sure I like the idea of promotion granted for passing trade upgrades. Nothing to say that a sparkling instructor also has the bearing and skills required to hold down a leadership position or the like.
I prefer the idea of having earned the promotion in the traditional way that the posts you can occupy have a rank requirement befitting the position. Some instructors have fallen on their sword over not having the interpersonal skills to interface with the chain of command at an appropriate level.
Note also that I refer to instructors and not QHIs specifically. It will take some time yet before many realise that AIs are all equals each with their own discipline. All of these instructional disciplines deliver capability although at present only flying instructors appear to have a monetary advantage in civvy street therefore do they need further recompense?