With a .030 wall, a part like that ain't gonna happen at a price anyone would consider reasonable, except the guy who actually does the work. By the time its done, he will figure the price is half what it should be, regardless of how much it may be.
Attempting to hold any sort of tolerance or finish on a part like this with a cutting tool requires that the tool be piloted near the point of cut. The problem with that approach is chips. They want to go places where you don't want them, particularly between the pilot and the part.
You might start with a piece of dead soft DOM tubing with a 13/16 OD and 16ga wall, then make and harden a bullet shaped swage tool and PULL it thru the part of the tube that needs to be 3/4 ID. The tube would have to be in tension for this to work, because attempting to push the mandrel thru the tube would likely buckle the tube.
Another approach would be to make a tool with a bearing on the nose that would ride in the bore of the tube, with a pair of ball bearings set in opposing pockets behind the bearing. This tool could be put in the lathe like a boring bar and fed into the tube. The balls would roll swage the ID to size.
In either case, you'd still have to turn the OD of the swaged section back to size, but that could be done with a follower rest and a sharp high positive rake turning tool, either HSS or insert type.