Park Avenues With A "Tux"

Hello all,

So in a few months I'm going to be a groomsman in my friend's wedding. He has chosen a black "tux" with a black 2B notch-lapel jacket, black vest, and black necktie - not exactly my cup of tea, but fortunately it's not my wedding either.

I'm not going to bother trying to change his mind on what he picked out, but I would prefer to avoid wearing the square-toed patent leather shoes he selected as well (just can't stand the square-toed look). I recently bought a pair of Park Avenues in black - I'd much prefer to wear those, but would they be appropriate for such an outfit? (would they be formal enough?)

Thank you for you response!