I suggested the use of an industry standard tool to which your reply is, " that's going to be difficult to use, hard on the back, and doesn't produce a good product."
You're stroking more than just some tubing.
Lighten up, Francis.
I'm sure there are a few other manufacturers of them but that is another product that Fein makes. It's ther "GRIT" line of belt sanders.
A company I used to work for has one. It's used on all of their tubing before fabrication since 90% of the parts are brushed aluminum.