Unfortunately, I don’t have any physical chess set to easily modify that way, but if I did, it could be as simple as taking one pawn from each side and painting a dot of red nail polish on the top, to indicate it’s an (optional) Joker piece, depending how the players care to play.

I also only know one other person in my area that used to be around to play chess with, but I haven’t seen him in a couple months.

Sigh, maybe someday…