Andy,
If I may offer a suggestion...adding a lengthy mudflap to your front fender will greatly reduce the needed cleanup on your Mark 1 Nomad. I have one I am very pleased with on my Sherpa. It is a Buddy Flap (
http://www.buddyflaps.com/ ) made of heavyweight 3mm thick high-quality vinyl, stiff in a breeze yet flexible enough to clear house steps and such without endangering the fender. I just removed the little "kicker-flip" from the bottom of my front SKS fender and transferred it to the rear fender before installing the Buddy Flap up front with a couple "pop" rivets. The upper rivet replaced one of the SKS originals, though Buddy Flap also include their own hardware should one wish to use it.
It wouldn't take much to cut your own flap from a section of similarly thick rubber door-matting.
In my experience, the front tire kicks up a lot of road debris directly onto the chain where it wraps around the forward edges of the chainrings. The mudflap protects that area below the fender, as well as a good portion of the lower chain run where it matters. A straight-edge from the front tire's ground contact point to the lower edge of the mudflap shows a contact point with the chain midway between the 'rings and the cassette, at which point the debris doesn't have much upward velocity left to dirty the chain. Fenders help tremendously over none, and I think a good front mudflap makes almost as much difference beyond that. Keeps one's feet drier and cleaner as well. Looking at your Nomad in the "Sunday Run" pics, I think it would help a lot. I would suggest securing it to the tire with a rubber band when car-topping, as you wouldn't want it whipping around to place a stress on the fenders at highway speeds while in-transit.
It might be worth a try, Andy, at least till you can try the other bikes on your next trip to Thorn. My cleanup is almost nil, even after riding in rain and over Fall leaves and assorted debris. Dead angle-worms are the worst, 'cos they stick once they harden and are terribly difficult to remove. Now, they land on the flap and can be left or are easily hosed off with a squirt from the water bottle.
Best,
Dan.