Not trying to argu with you but I can't see there being any point, at the end of the day the insert goes down only so far, the 135mm rule is just trying to insure that it is below the bearing on the headset so that there isn't a shear point where the insert ends. The weakest part of the forks.
I'd estimate that the headset being 135mm from the crown is leaving an estimated overlap of 10mm, personally I would rather it to be twice that if it was me.