Nothing. You can only invoke article 7 against a specific country, and with 2 there’s insufficient votes to invoke article 7 against either. You can’t do a “twofer”.
You have to remember this was considered an unthinkable nuclear option when the treaties were draw up. That two countries could both diverge so far from the EUs ethos would horrify the (possibly naive) original founders.
As that worn quip goes
" they did nazi this coming"
For me this falls in the category of “sit back and eat popcorn”. Both sides are arseholes I don’t mind which loses, in fact it’s a shame they all can’t lose