Do you need to evolve all the keys? Can some be just a basic upgrade that grants "X" more power because they don't warrant any further development. And use the third stage, the evolve, for powers/abilities that naturally you can see a furthering of? This way you don't need to crush yourself doing all of them but only certain ones. This way you pose the question, "Does this power have a third stage?" If you look at the power objectively and say no, it just can upgrade and be done with it.