Jester: An idea for a new piece for extra piece variants

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AverageChimpanzee
I saw a variant where players can deploy 'hawks' (knight+bishop) and 'elephants' (knight+bishop) to the board after moving a piece. I've been trying to think of a new piece with rules that aren't too complicated, but are still unique, without being ovrepowered, and I think I got it. 'Magician' or 'Jester' Queen+Knight BUT cannot capture enemy pieces. It CAN, instead, swap places with any friendly piece that they could 'capture' if they were the opponent's pieces. (including the king and pawns) What do you think? Cool idea? Could be implemented?
Drawgood
I think this variant already exists. Seirawan Chess for example.