i wouldnt call it inventing a trick. i would call it working on a routine. there are many effects where cards are changed from ace of spades, clubs, dimonds, hearts
so its not a new trick in any means. and there are versions that are better than this one where all the changes are done at the top.
check out patrick kuns youtube page for example. he does a valentines day effect that is essentially what you are doing, but using more than just 4 aces or any 4 of a kind for that example.
But its good that you are trying to use whatyou know to make up routines.