I converted my Super Sport with the goal of dropping weight, and that Ashtabula boat anchor sure is heavy. But that doesn't seem like the overall goal for you, and, of course, if you do the conversion, you'll have to fitz with figuring out the correct spindle length and spindle/crank compatibility and JIS and ISO and YMMV. In other words, it'll take a great deal of activation energy, and I'm getting tired out just trying to describe the process.

Neal