Something I tried once, that I saw suggested somewhere else (don't remember where but I think it was a swimming and underwater modeling forum or something, I just Googled it): clear silicone ear plugs. Instead of clipping my nose I just shoved them up my nostrils and kind of molded them into shape (they're very malleable). It worked very well and didn't show at all, though it felt pretty weird and obviously it sounded like I had a bad cold if I said anything :P So it might be good for underwater performing or videos but not if you also had to talk to kids or something.
Disclaimer: do this at your own risk. I only did it in a very shallow pool, but if you were to freedive like that, I could see the water pressure shoving the silicone too far up your nostrils and perhaps getting stuck or causing damage.
But I might try this again the next time I actually do any underwater videos because I have major issues with getting water up my nose and being very sensitive to it (oww arrrghh) and I can never seem to strike the right balance between not getting water UP my nose and feeling miserably uncomfortable, and not blowing air OUT my nose and looking really stupid.
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