Yes, you can actually edit PVRs and put them back in game!
Please note to rebuild the archive, you must remove the header from each PVR file (0x0 - 0x20) and copy /b files according to number:
Example:
copy /b 1_collar.pvr + 2_dummy.dum + 3_shirt.pvr + 4_dummy.dum + 5_sleeve.pvr + 6_pants.pvr TEXTURE_FUKU_UNI1.bin
