I know the sledgehammer routine for removing tubs is the standard
answer but I'd like to remove this one intact.

I've got the bathroom down to studs, I've got the bathtub off the
floor and face down on a 4-wheel dolly. The bathroom is exactly 5'
wide its entire length and there's just not enough room to swing the
tub so I can shove it through the door.

It seems like the answer - short of removing wall studs - is to put
the tub back down on the floor, bottom down, and then tip the tub to
vertical, followed by tipping it back down face forward onto the
dolly.

Or is there some other way of doing this?

TIA

Tom Young