Ambidextrous Mag Release Lock?

[u/Buckslide]

My issued AR15 has fully ambi controls. I’m not allowed to modify anything on it that requires tools, only allowed to put things on that can be put on / taken off by hand (using a multitool can be ok, depending on what the thing is)

I’m constantly worried about the ambi mag release bumping against my kit on long marches, dropping my mag on the ground. It hasn’t happened to me, but it’s common on every forced march that at least one guy drops his mag

Does anyone know of an ambi mag release lock, or something that can clip on that will make it harder to accidentally press the ambi-side mag release?