By any reasonably strict reading of the rules, this is the sort of thing you accomplish as a result of a successful Thievery check. Saying "oh, I can't use Thievery to disable it, so I'll just wedge something into the mechanism" is like saying "I'm not trained in Perception, so I'll just look and listen harder to make up for it".
While I agree in principle, it seems to me it is also the sort of thing you could use a stunt for (the rules on DMG 42), as long at wasn't as easy as the Thievery approach.