The AT-AT Driver and TIE Pilot have pretty distinctly different helmets and I believe their bodyarmor as well has significant differences also... Not to mention the boots too now that I think about it. So yeah I'd be happier seeing the Death Star Gunner used as the base, or at least his arms/legs since they're kind of "ideal" without super articulating them, and then from there either a new body that incorporates removable armor/helmet, or a whole new torso since I don't know that the "hood" was on TIE Pilots from anything I can see in pictures.
But yeah, the AT-AT Driver's helmet, armor, and boots are pretty substantially different from the TIE Pilot's, so I don't think I'd be into that myself as a repaint.