Comparing your diffusion device to a scanner with the same functionality software adjustable in fine steps, but not used, frankly makes you look utterly clueless.
The difference between software treatment of a scan and hardware improvement of a scanner is something some people seem not to understand.
Anyway, with my solution it is still possible to perform any descreening you desire on your scan. Descreening is nothing else but unfocusing the pixeldata by digital means, so descreening generates loss of definition, a Scanhancer doesn't. For a fair comparison it is thus best do perform no descreening on both scans, as there might be differences in the respective software packages.
Also: how hard one will descreen ever, the white dots in the Imacon scan will stay there, although less sharp perhaps.
Erik