Is there an emergency egress system to unlatch the canopy from the rear seats?
Many years ago a supplement was issued to the Long-EZ plans which showed details of an alternate latching system with an emergency release cable running to the rear seat. The supplements may still available from Debbie Iwatate. Alternatively, consider that the turtleback bulkhead and the head rests are wide enough for a small-to-average-sized adult to wiggle through to access the canopy latch.