In regards to the fork-crown mounted cable stop - I just bought one from the LBS for $20 and installed it.
Incidentally, this is also on a Miyata that had a too long crossover cable that needed replacing anyway, I decided to make this upgrade at the same time after reading this thread.



This one is made by Specialized, and I had to do some creative fiddling to get it to mount properly with my fenders and not scrape against the bearings. I was hoping to get the Tektro model and in silver, however this is all they had.



What you see is an old washer from a center-pull brake that's been reversed so that the concave section that would normally press against a rounded fork crown is holding the hanger in place, and a lock-washer in between to hold it and act as an extra spacer. Normally this would be mounted with an L-bracket that came with the kit, but the spacing wasn't enough and it interfered with the fender's tab.

I had a photo of the the Tektro one loaded on my phone to show them what I needed at the LBS. The one pictured is labelled "Tricross Fork Brake Hanger" on the package and included mounting hardware for alloy and carbon fibre forks.

Please ignore the rust visible in the photos, I'm still in the process of cleaning this bike up.