Hello everyone.
I'm not currently an MoI user because it doesn't have some of the features I need, but I have used it and really appreciate the care that's put into its development. I am however, a ViaCAD Pro user and that's the reason I'm replying to this thread. I just wanted to point out that the shape posted by Michael, can be blended in ViaCAD if you use the right option. It worked OK for me with a blend radius of up to 2.4 before giving an error message. To do it successfully you need to use the Variable Blend tool and select the Fixed Width option within that tool. I'm including the SAT file I made, for your scrutiny.

All the best.
Martin.