Remember that if you still have an elevator, you may still be able to use negative G to get out of the glider: Jettison canopy, unstrap, the push the stick forward HARD and you should pop right out. If you have time you could even run the trim full forward.. ;^)

Might not work in a spin, but would probably work well in a wind-up hi-speed spiral.

Used a lot during WW2, there is even gun camera film of pilots "popping" out of their cockpits while under attack.

Kirk