Shep
Shep of the Dessert
Theres a chap on Advrider, Phreaky Phil, who fitted an 1100 rear disk. I'll go down this route when mine wears.
Lovely machine work.
Adventure Rider link
There's a lot more to it than a simple bolt on but he explains it in detail on the thread.
Is that more or less work than fitting a complete 1100 arm wheel and final drive??
Shep

I forgot your were riding one of those bizarre contraptions
has anyone tried that approach to a better brake?


) back them off a bit first then torque them.