On monocoted aircraft, I have used monocote itself to attach the canopy. Use just enough heat to get the monocote to stick to the canopy. I usually use strips around 5/16" wide. Check out my gallery and look at the Skybolt. It uses the monocote method. I have been through crashed and the canopy is retained. Some simple slicing with a razor blade and you can remove the canopy.

JMO