If this suggestion (raising gear) is coming from professional pilots I am worried.
If the situation is
so desperate (3 calls and all that) that drastic action is needed, a firm push forward on the T/Ls will stop the a/c landing and force a g/a. Raising the gear when the other pilot is so obviously 'out of it' and fixated could well result in a wheels up landing. A quick punch in the jaw works too. I once had to 'karate chop' a student in RAF days who had landed with the footbrakes on - that worked too
.
Better to be arguing with the chief pilot about why you did it than being dead.