If he is going to throw an overhand left, Keep your right hand well up for starters. Then:
Circle left and leg kick.
Alternatively shoot for a takedown.
The faked glove tap is so effective because it is unexpected not because it is a complex riddle with no answer.
I would simply not touch gloves with the guy, because he may throw the overhand left, but hey may throw some other strike or a take down, whatever.
Touching gloves is not essential and if you know this guy is dirty in this regard don't give him any fucking advantages you don't have to.
If you touch gloves with a guy like that you deserve to lose. But good luck.
Guida, Cerrone, GSP, G-Sot, Carwin, Kampmann, BJ, Paulo, Forrest, JDS, Machida, Noke and ya gotta love Hunt.
Barao to rule them all.
Never forget the freedom fry!!!