That works on many levels. I'm not even sure why the national anthem is played before any sports game to be honest.
I don't want to know anybody's politics by looking at their jerseys. One of our US Senators from Georgia is an owner of a WNBA team and her team was wearing jerseys supporting her Democrat opponent. I wonder if that's considered an in-kind contribution of some sort.
The NFL was thinking of going that route, but our side had a fit about that. Somehow it’s OK for college players to be in the locker room, but not the pros.