Would Tribex-500 work if you have desensitized LH receptors?

First, I don’t think one would have desensitized LH receptors except via misuse
of HCG (the method I recommend is no more than 1000 IU per day, and generally 500 IU per day is entirely sufficient.)

Even given that, I’d expect that all it
takes is some time for sensitivity to return
once the misuse ends.

Even given reduced sensitivity, still, more
LH (within normal range) should produce more testosterone than less LH, so Tribex would probably still be of some benefit.