Chadderz had told me in a stream that his converter can convert BACK from the XML, I decided to try it out with my theory on how the game knows what objects to load. There's an ID that each object has, just like MKWii. I changed the sizes of objects, and kabaam. There's a level edit.
I just made some objects bigger...Chain Chomps, and the Coins.
This was done with Cafiine and the kernel exploit on 5.4.0. Stick around and see more soon!