Although it is technically possible, it's not really worth the amount of time and effort it would take.
1. The PS3 sprite patch does not actually help us, since the filenames are hard-coded and cannot be easily switched without changing every part of the code that refers to a sprite name... which is a lot.
2. Making a fangame compatible with the Steam release's sprites wouldn't work, since this fangame takes place during the Chiru arcs, and many of those characters do not have Steam sprites yet.
3. Even if we could do 1 or 2, there are still many custom sprites created solely for this fangame that would look out of place if we converted the rest.
So unfortunately, we won't be implementing that feature any time soon, since I have moved on to creating other games.