An alternate would be to drill and tap a couple very small holes to screw things together which would allow the use of a good thermal paste to help heat transfer to the sink. If you went back to using it the way it was originally designed I doubt the lost metal from drilling the holes would matter, especially of you popped in a couple set-screws to fill them flush.
Phil
Like that idea Phil, though we would need to space it with heat transfer pads as the components are at differing heights that need to be covered.
Also as an update, I have been using the camera in hot (or at least as hot as it gets here in the UK) for a three hour round trip to Cardiff yesterday and it appears to be holding up just fine - that would probably be the longest journey I take in the car for an extended run, my car is second or third on the list and is more just for fun than a daily driver - Bike for commuting daily and the family Qashqai for longer runs normally.