That's a shame if it was what you wanted.
While waiting for your perfect bike to come along, why not strip down the Nomad and see how that handles such usage? I haven't ridden the KAW yet, I've seen some video and although the surfaces are tricky in places, it isn't particularly technical. I'll probably use my 16kg Surly Ogre, depending on the weather I might strip a kg or two off that, then of course the luggage which I doubt I'll get below 10kg. My tyre choice is the one thing that concerns me. Set up right I can't see your Nomad would be much disadvantaged in any way.
Nothing wrong with additional bikes of course, I'm in no position to criticise! My bike errors over the years, and there's been a few, have mostly resulted in too much overlap, even my current four" bikes could easily be two. If I were looking for something from the Thorn range for light and fast non technical off road, it would be a 650b Mercury, stripped down to the minimal spec. That would be even more so for a rider a bit lighter than myself. My 700c Alfine Mercury comes in at 11.5kg, it's the largest 610L size and I wasn't really trying.
*I'm not counting my work E-bike and two folders...
