I was about to say what you said at the bottom: "let someone else do the mixing." my dad gets my brother or i to help him stir a batch of fudge when his back an shoulders have had enough of the stirring.

maybe you could try microwaving the dough for 20secs or so so that its not quite so stiff? its what i do when ice cream that has became a solid brick in its container in the freezer an it sure helps a LOT. but thats ice cream. but i cant think of easier methods of mixing dough. it can be a pain thats for sure. my mom an i have found that out the hard way LOL