The only thing easier than installing a Helicoil is not having to install any thread insert at all.

There is nothing tricky about installing a helicoil. Using the proper drill size, drill out the hole, using the special Helicoil tap, tap the hole. Screw the insert in till it sits just below the surface of the pan rail. Break off tang, do next hole.

I just use a nail with the point filed flat, ight be tricky getting needlenose into an 8mm hole, but if you had a tiny pair ot maybe some Hemostats it might work.