Item 4: A_M_Swallow is correct. The only way to prevent the ISS from dragging the balloon at impossible speeds would be to move the ISS to approximately GEO orbit = altitude about 22,000 miles. That would take months with 10,000 ion engines of present design, but more powerful ion engines (or equivelent)may be available soon.
A resupply craft and crew transport craft would have to be developed for the ISS at GEO altitude and that may be as costly as going to the moon. The crew of the ISS at GEO would be subject to several times the radiation they experience at LEO. Neil
Thank you both for your comments!

I have no problem conceding that what I don’t know about space could fill up the Internet!

1. From what you are saying, some object must be at 22,000 feet +/-, to serve as a Space Elevator Station (SES).
2. How long it takes to move the ISS is not a factor, as the SE Ribbon will take years to develop anyway.
3, Of course the cost of relocating the ISS vs lifting a different object to 22,000 feet to serve as a Human Inhabitable SES (HI-SES) is a factor.
4. Also if humans "… at GEO would be subject to several times the radiation they experience at LEO" then any HI-SES and any SE carrying humans, would have to consider the radiation exposure problem.
5. While the functions (including maintenance) of a HI-SES could initially be automated (a less expensive and expansive NI-SES), eventually humans will want to travel into space and thus the need for a HI-SES.
6. The problem remains of how to connect a durable SE Ribbon between a HI-SES (or NI-SES) to a Earth Based SES (EB-SES).
Ken
