I made a new mount to hold the lasercutter lens. It’s sized to fit snugly into the rubber mounting of the camera, and there’s a piece of folded copper wire as a removal tab: 

Here’s some more close up images:

(By the way, the above images look cool, but you should never trust the display of a thermal imager pointed at metal. Metal has a terrible emissivity, so you’ll end up measuring the reflected temperature of the wall instead. If you really need to measure the temp of something metal, put a small piece of masking tape on it first and then measure the temperature of the tape.)