It's tempting, but I'm not convinced there would be much more benefit than the sometimes recommended "slack" centre hole and tightening the spindle with the brake on.
However, I still think there is potential in the shoe pivot location. In my current read " The Vincent Black Shadow," there is a photo of a brake shoe captioned as having revised geometry - source Vincent spares, but they are not on the shop lists as such. The shop ones look to be stiffened up and that's all ?
Just looked at some Norton 8" SLS front shoes and the pivots are well inboard, surprisingly so, yet that bike does not grab or sprag which makes me think T.S. really did have a point .
This could be a mod worth some effort as I do not like those cheap, nasty, high friction woven linings at all.
It's on the ever increasing project list..........!