Nothing Conor will do will bridge the grappling gap. Khabib has been grappling since a very early age and is physically stronger than Conor.
Remember Conor could made FW, Khabib missed weight, pulled out due to a weight cut, and apparently had a seizure to make weight for Conor. Just because Khabib doesn't look jacked doesn't mean he isn't dense as fuck and heavy for LW. There is a reason he out muscles everybody at LW.
If they do fight again Conor should just go for broke, ala Diaz 1. He has to just drain the tank and hope something connects. His game plan to weather the storm for 3 rounds was the worst title fight gameplan I've ever heard of.
I still don't believe that Khabib's striking is as good as people think. One quick overhand off a TD feint doesn't change that. That's Conor's only chance to victory, and it's slim. The multi year layoffs and drinking fight week sure ain't fucking helping either.