Thanks guys - love the knowledge this forum always provides!
The regular 777 usually means I'm the first off and if I sprint, the first in the immigration line. Not having not flown a Mid-J 744 into BOM before, I imagine with PE directly behind F, there could be quite a few people getting off in front of us! Usually no priority line for e-Visas either. The Buggy could be a good way to get a head start.
Hoping the plane gets over Mumbai on the stoke of midnight as it would be fun to see any NYE fireworks from the plane! If its early we could be ringing in the new year from immigration.
At least I could say it took us a year to get through immigration and it won't be an exaggeration!