I like the idea of adding paper clips or whatever to reinforce the epoxy. Here is a pic of the fully cured light reinstalled in the bumper. One of the two tabs that hold the ceramic part in the plastic part is broken, I didn’t have anything I could use at the time to epoxy there so I put some gorilla tape on it and will address it later. Otherwise it is mounted and looks normal from the outside. Just wanted to document all this in case someone else has the issue and is looking for a fix.