I don't know if anyone has tried this, but I have a tip that may just work.

I work in a snowboard shop and we sometimes have troubles with the screws for the bindings coming loose. We solve this by applying a teflon tape that is used by plubmers to seal the threads on pipes.
I'dont know what it's called in english. We just wrap as many turns of this as we can around the screws without making it impossible for them to get properly seated and tighten them up nicely. They never come undone again. This should be heat proof as well since the tape is used on hot water pipes.

If someone decides to try this out it would be great to know the results here.

Cheers