Trying to remove and reinstalled glued pvc, using either flex hose or hard pvc, is at best a joke. Even if you were able to, you'd never be able to get a good seal when you used it again.
Unfortunately, circumstances like this require a bit of reengineering to get them fixed; (A $200 solution to a $20 problem). Yeah, if you were installing one from scratch, it's like a 30 minute job. But since you want to keep everything intact, then your relegated to something like this:
http://spasupport.com/plumbing/jetrep1/
I know it's not what you wanted to hear

, but you don't have much choice in the matter when you're dealing with pvc fittings under on and off, hot and cold, high pressure/lowpressure -- continuously dynamic conditions.
Let us know how you make out with it.