I would probably get a new piece. I don't know how hot that part would get but it sits close to the heat source. Any epoxy or glue/cement you use may get heated and who knows what that will do to you? If you don't have the money to replace the piece then take a gamble and use epoxy. I would look at this as a reason to get a fun new piece!
See the guys above are correct, but these chemicals these days exhaust serious fucking gasses no matter how much,....you will be inhaling those gases you may not notice over time, but will shjow on your X-ray in time to come, get a new peace