Yea, hot water therapy should work here. Immerse in near boiling water for about 15-seconds until the part is pliable, remove and then work the change you need. Then run the part under cold running water to "lock" the plastic. It might take several sessions over a period of time to retrain the plastic back into its original manner.
The trick to this is two-fold: finding something big enough to hold the water you need to immerse the part, and getting a pair of rubber-tipped tongs to hold the part without damage.
I would heat the water separately , and pour it into a pan or large bowl.
Don't leave the part in the water. dunk it for a count of 15 -20 seconds and then pull out. If the water is really hot, that is all the time you need.
Leaving the part in the water will cause the plastic to really deform and warp, making straightening it out a royal pain.