I would try the hair dryer to see if it would allow the wrinkle to go away but my fear would be that it gets too big and then is saggy.....
AHHHHHHHHHH......If you live near the water find those guys that make the see through plastic enclosures for boats....you know on large yachts.....I have seen them on flying bridges on sportfishing boats below the Tuna towers....It is worth a shot.
These guys maybe able to help.....I bet it is the same material....
Good Luck!!