Over ear as in completely around? You would have to modify them with a larger baffle extension, then new pads that fit, but you wouldn't get the proper sound after messing around and spending $ better put towards what you actually want. Not to mention they would not look that great. If it could even be done properly
These are specifically designed to be small and rest on the ears which is why they have no passive radiators like in the next size up K141 or K240 series. Bets bet is to move up to a K240 that's as much 'around ears" as you are going to get. The K141 rests lightly on top also just like the 140.
If I find anything compatible with the 140 I will let you know. AKG has a ton of models now so there has to be something that will fit somehow, hopefully. I would check fleabay or something for AKG PADS and see whats around in the smaller sizes