I had the same problem,but managed to fish mine out, I would say it will not do any internal damage, its 98% plastic with a very fine copper wired coil through the middle, that against a T/C and flywheel, its like a 40 ton truck wheel running over a walnut.....
As for heating up, I wouldnt, due to risk of fire....but thats up to you, I used various sizes of of screw drivers to get mine out or rather in, but do take it easy, you may find it disintegrates as you go in which case you will be able to pull back most of the bits with long nose pliers, the middle bit went through quite easy, the outer sleeve part took a bit more time to remove, if you havent got a rubber grommet in the bottom of the bellhousing I wouldnt worry about the bits they will just lay in the bottom for years to come.
VELVET BLUE UK INDIVIDUAL , IM THE LAST
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I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!