Mag limits suck! You might try this link:
I'd get some of these, at least for public appearances. If I were in your shoes, I don't know what I would do with the standard capacity ones. For me, getting rid of them or altering them permanently would be out of the question, since this crap may go national (again) if Hillarrhoid gets elected. If this happens, it's likely that the mags would be grandfathered in under the national
law. Top priority is to get them to a legal safe harbor (out of state) so that you can retrieve them once you're able to get the heck out of NY. Maybe leave them with a trusted friend or relative? Maybe in a safe deposit box, or self-storage unit in New Hampshire? When you transport them to the safe harbor, don't give the cops any reason to notice you. Make sure your tags and inspection stickers are current, and all your taillights and brake lights are working properly.
If legal options aren't practical, I can't tell you what I would do.
Incidentally, I bought several mags for my PMR-30 before I actually found a gun I could buy, just in case a mag limit went into effect before I could get one. This was during that period a few years ago when it seemed like there was a new mass shooting every time you turned on the TV.