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Looks like he was able to separate it without damage to the plastic, so epoxies (including jb weld) seem like they'd preclude future repairs.
There are 4 clips that mechanically hold the mirror. The adhesive is pretty soft and seems like it is just intended to stop the mirror from vibrating. An epoxy won’t work as its plastic to plastic and the parts would never come apart again. I think some kind of silicon adhesive is what is needed.