You're right, it's plastic.
Jb weld flexes but not well enough to keep up with the thermal things going on with that plastic.
AND
some plastics have a wildly high water absorption rate. You won't notice it by yourself without test equipment and a good scale, but it's one of the reasons things don't bond to them.
Try the
Tough As Nails(shoe goo or 6000 will work, but it doesn't finish well and doesn't like to be overworked)
For now.
It grips well and the absorption doesn't kick it off the plastic easily.
Sand the crack flat
Use a credit card to moosh it into the crack,
then water wet the card and use it to get a pretty good finish on the top.
It'll do nicely, maybe permanently, while you decide which way to go for a cosmetically pure fix.
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