I just did it as a one-off for my grandson's bike. Chris Cosentino already offers a really nice conversion for Norton forks using the same cartridge. I pretty much copied Chris' work, with a few changes, so it wouldn't be right to try to compete with him. Besides, in my old age, I'm winding down the sales side of my hobby/business, not growing it.
See Chris' conversion here:
Cosomoto builds the highest performance racing motorcycles in the world, using Cosomoto's Friction-Free Front End.
cosentinoengineering.com
Ken