At GTL, after 0730 there is no train towards DMM/ SBC. Few odd crawler weeklies are there coming from GY side. So a SF ICE train can be there by 0815-0830 which can reach SBC by 1300.
Similarly, from SBC side after 1340 Prashanti, only one tri weekly Kondaveedu (a slow train) is there towards DMM. So, SF ICE can start by 1415-1430 overtake Kondaveedu at YNK and reach GTL by 1900.
Definitely possible, but SWR SCR should work together.