When I built my -6 tip-up I installed the stock release handle, in flight egress was a no brainer "pull the handle". I decided that in an off field/water landing that I would release the canopy just prior to touchdown. With my -7 slider, inflight egress would be to unlatch canopy and figure it will go "away" in some form or another. For an off field/water landing I installed 3/16"x3/4" McMaster quick release pins in the forward canopy rollers in place of stock AN3 bolts. The plan would be to remove the pins sometime during the approach and just prior to touchdown, unlatch the canopy and slide aft. Again, figuring it will go away in some form or another. Hope I never have to test my theory!
Another thought in the event of an overturned a/c was to relocate the fuel vents to the wing root fairings to prevent fuel from running down the belly into the hot firewall/exhaust area. I used a 3 loop setup that I am told the Rocket guys use, no problems so far.