Armor procedure with powder snow

I'm fairly certain this would require editing the block itself...  that being said you could try something where if the player has the full set on it checks and subsequently replaces any powder snow the player is in with an identical-looking block, which will replace itself again with powder snow X ticks after the player exits it. Only issue with that would be it would also allow players without the armor to enter the blocks without damage on multiplayer, so perhaps a secondary script on the custom lookalike block is needed to check if the player has armor once again, and if they don't it deals damage?

TLDR I am fairly certain that without editing the vanilla code manually there's really only workarounds, let me know if you do find something though.