I've taken heaps off
even QB paddles with those eva handles
never a problem. I've worked with graphite before SUP

Tips
1 you need to have the heat gun on medium.
2 dont place the heat gun to close about 8"
3 move the heat gun around so you don't get hot spots on the graphite.
4 apply heat for about 1min,, then think of pulling the handle straight with a very very slight twist. "
never turn the handle like a tight vegemite jar " you can make the graphite puff and wreck the shaft and handle.if it won't come off apply a bit more heat say 20s, if still to hard, again another 20s and so on.
5 to protect eva handles, just place a bit of wood in the way of heat.
6 be careful if using a vice to keep the paddle still,as you can crack and scratch the shaft.
7 use leather gloves so you don't get burnt.
i have even extended paddles with no problems Umm thats a little bit more complicated