Your idea is sound, keep in mind that each piece in the Chess set is characterized by height as well, basically the more important the piece the taller it is, this is how we can play Chess with just wooden dowels of 2 colors as the pieces, so you should choose a round that fits in with the height of the role compared to the others
The official height from tallest to shortest is King, Queen, Bishop, Knight, Rook, Pawn.
I collect Chess sets and have them from all over the world, I can tell you if it's difficult to identify the pieces, people won't want to play with the set.