I just checked back in on this thread in the hopes that there had been some further news of the editor. Sigh.
And BTW, the Celestion F12-X200 FRFR guitar speaker is finally available. It will not surprise me if this driver, or a tweaked variant of it, ends up in the Kemper Kone. I'm gonna buy one and build a cab based on this article:
$175 for the speaker, good quality excess plywood, and a few bucks of parts.
My guess is it will be the F12-X200 without the compression driver, maybe similar to a 12L.