You will have fun with this!
Yes, you are right to steer clear of acetone. I used fingernail polish remover without acetone to wipe a faceup and it worked great. It had dark colors, too, and I was very happy with the results. You can use a toothpick to get into the crevices of the lips, etc. Mainly, I used cotton pads, then I switched to q-tips, and finally used the toothpick for the last remaining bits.
Clean it well and let it dry thoroughly before attempting a faceup. And use MSC flat to coat it. Spray a light layer before you get started to give the surface some "tooth" so the pastels and paints stick. Then spray lightly as you work, to preserve what you've done. When finished, give it another coat. Keep the coats airy and light.
Good luck!
Mary