I'm looking through the EDDecompiler repo and it really just looks like a whole lot of random hard-coded values. Sorry if this is a silly assumption, but wouldn't you need the game's source code to figure out all this stuff (without an impossible degree of trial-and-error)?
If EvilGoku was able to create a patch for Zero no Kiseki Evolution, I assume he would have to have already made something like this for the Evo format?
I've not done any sort of modding before, but I'd be interested in trying my hand at it if some resources are available to start with.
Also just in case anyone's wondering, I tried patching PC scene files into the PSP version but it crashes as soon as you open any dialogue. For now will probably just use a PC->Vita streaming service with the PC Ao.