Thanks, I Hate It!

If you're going to go with that, then I'd say it would be more like this:

But I still think philosophically the point of a centaur is that it's a horse with a human's upper body sticking up. It has 6 limbs only because a horse has 4 for walking, so the reverse would have a human's 2 for walking and you could debate whether the arms would be human or horse.