I've done it. Do you want the stump still UV'd to fit the vanilla PLC_GenCorpse texture, or expanded take up the full 0:1 UV space since you presumably have a standalone texture? I can do the same with the hand and arm. Resize their UVs and assign them a single custom texture.
Edit: I just went ahead and remapped it. Hand, arm, stump all now share one unified custom texture. UV layout guide is included in the attached (using the custom texture name).
As for releasing it, go ahead, you know the drill.