I would not dive a patched bladder that, if the patch failed would result in a MAJOR leak. Just not worth the risk to me. I have patched bladders many times, but they were relatively small holes that would be an inconvenience, not a problem if/when the patch fails.
Also, I'm not sure that a bike patch is the correct method to patch a rip. i have used aquaseal as a blob for small punctures and have used a water bed repair kit with a plastic patch for slightly larger holes.
I am not so sure that aquaseal is going to hold so well on a bike patch.
---------- Post added March 23rd, 2015 at 05:11 PM ----------
Also, I was not aware that pinch flats were such a big deal. I have never gotten one and never unfasten the plate and the wing. However, I just recently realized that most of my plates have wetsuit neoprene or a piece of carpet affixed to the plate. The wetsuit is tied on with string (via the perimeter holes in the plate) and it goes around the back of the plate, so the sharp edge of the plate is covered by a layer of wetsuit.
Why don't the manufacturers do something similar, if this is a real vulnerability? Disassembly before and after each dive, doing this action HUNDREDS of times per year is beyond ridiculous to to me.