You have to get lucky and find the right random game. But try to win the game with every single object in the gold castle - but the bat is holding NOTHING at the end.
It can be done. I've done it multiple times.
Have you checked with the folks here at Atariage store? Several years ago I had carts made of all the Flashback games that were not original games. I know I bought some of them from here. So they may have them all.