Copying and renaming mass amounts of .spl-files with weidu

I saw some thread here in the forums requesting a Favored Soul kit, and I decided to have a go at it.

What I'm wondering now is if it's possible to copy every priest spell and rename the copies so that they get a custom prefix but keep the number suffix. So bless would become ABCD101.spl for example. I would also need to change offset 0x001c to 1 for every spell copy.

Any help would be much appreciated!