Hum, have you tried decompiling everything on the same folder you have the .jar?
To make it clear:
on the folder, you have the .jar file, maybe the .exe file, and then the data folder (with saves)
You can un.zip everything from the .jar as "extract here". The folder then will be filled with all the .Jar has.
Now you can simply work on the decompiled stuff, and if I'm correct, the decompiled stuff overrides the compiled stuff.
Whatever you delete from the decompiled stuff, it won't affect the game, since the .jar will look for the available options, and if you deleted a decompiled thing, it will call for the compiled stuff.
Example:
let's say you decompile everything. Delete everything 'cept the folder that has the pic with Urka's fuck (basic one, not doggy).
So, you can work specifically on that pic, and all the rest is handled by the stuff still compiled.
Basically, the .jar looks and finds the compiled and decompiled, and it takes priority on the decompiled. But if it needs another pic, without any decompiled things, it simply uses the default compiled "inside" stuff"
It's like working with extensions.
It works on most games, but not sure with ToA.
If it does, it'll save you a TON of troubles and time.