Don't see why you couldn't use the freebie MatPoseEdit software for this. You can pick it up here: http://koti.mbnet.fi/ilaripih/MPEHome/
Also pick up the tutorials that are available there and elsewhere (try a Google search). It's fairly quick and easy to use.

Just a note: If the texture you have for your V3 character is from or uses any part of a commercial or freebie texture, most likely copyright laws will prevent you from distributing it (free or otherwise). Just in case you didn't know (and I can't tell from your image or description) - the texture has to be 100% original.