boss,simply take an unreserved ticket and as said by blog entry sir,,consult with tte..pay him difff fare..this is the safest way...i once made it in hwh-pbr exp..same thing..that time i waited for tte..but no tte came till kgp..just aftr train departed kgp..tte came to check and i showed him the original ticket,not unreserved one ..in your case if tte comes show him both..if not show 3ac ticket only