serious suggestions:
1. Regular board with all the pieces. The queen's deck can be any elements, and number of cards you want (this is for a closer likeness to chess).
2. 1 hourglass in the middle or 3 spread evenly across the center of the board like this: H S S H S S H (H=hourglass, S=empty space). There are still duels (best of 3) and all the other rules about attacking other pieces.
3. Promoted pawns still keep their decks and can choose any 3 cards to upgrade. (I know this changes nothing... just wanted to make it clear that this isn't changed).
4. Attacking pieces can use 1 upgraded card in that piece's deck. (This somewhat compensates for the unsure victory of killing the piece that you are attacking).
In my opinion, this would make the event a little bit more fun and related to actual chess... which would make it more fun, also).
I hope the suggestions help