I don't think you can fully get rid of shapes. Shapes is what would limit using the same evolith over and over. For example, using STR +6 on all 15 etchable slots you can possibly have at the same time. I think merely adding the "instant evolith" ability and having THAT section be able to override any shapes, or at least add alot more shapes than normally permitted, and adding better evolith like on Karby's list, it would be much better.
Like I was saying these two elements were missing from evolith. By adding them you don't need to change anything from the old system. All you're doing is adding. I still see alot of the old evolith being useful when they're able to be instantly equipped and removed at will. The newer evolith we're proposing would be more suited for more permanent solutions for the etch-able body pieces. So you're adding evolith, instant system, and adding hunts. Much more easy than redoing an entire system.