Via GTL will be a good idea. The distance overhead is hardly 150-200 kms, and if it is given an SF tag, can easily cover the distance with only 2-3 hrs more than the current run time. It can leave CCT in the evening and act as an ONT between BZA-Dhone/GTL and reach LTT by night time; Depart late night from LTT and act as an ICE for GTL-BZA and reach CCT early morning.