I was thinking that as well. Or stick your feet up there and push off with your legs. At 1 or 2 kg underweight you will get enough separation that you can kick away.You're on the ceiling? Cool. Flop on your back and crawl out.
Dody, spend some time doing what pilots call unusual attitude training. Dive on your back, head up, feet up, right and left side up. Try some rolls, including holding it while kicking every 45 or 90 degrees. Once you are comfortable with this and are sure your gear is well secured, you can work up to Immelmanns, inside and outside loops and barrel rolls.
I do some of this on every dive. It's fun, you'll find out if your reg has any wet breathing issues (and how to deal with it) and it will help you be a lot more comfortable if you face a situation where you have to be in a non-standard position. And it's fun. Which is kind of the point.