Simple but completely game-changing idea: The king and the queen swap roles. That's it. So the queen can get checkmated but not the king. The king is just kinda 'there.' Both pieces still move normally, but if your queen becomes trapped and is under attack, then that is considered checkmate. The king only acts as a supporting piece.
Interesting but way too drawish. A bare queen can probably prevent forced checkmate against almost any army.
Simple but completely game-changing idea: The king and the queen swap roles. That's it. So the queen can get checkmated but not the king. The king is just kinda 'there.' Both pieces still move normally, but if your queen becomes trapped and is under attack, then that is considered checkmate. The king only acts as a supporting piece.