Going non ETOPS the 757 will need to stop for fuel.
Chances are GSM will get their 757 flying again or find a replacement but its whether they will do it before you go?. NEOS A/C probably wont arrived until May and with their own 767's lease to AI likely to be extended it looks like 73's wherever they can squeeze them in, swapped with a 75 if they get one or can get thier own off the ground.
If luvly Jubbly (or anyone else) can confirm the 73/75 situation it would help.
I hope they dont stick with a 73 and non etops through March. I know a few people who wont arrive on SFB at the scheduled 4:30 on the Saturday. More likely 10-11 pm if they're lucky with the Sunday looking more probable.