The thing I have found out using the Waddington Shanks is I do not have to build the underbody up.
In the past I have been using the Grant underbody to get the Ovated shape I wanted.
The Shank with itís parallel wires dose away with that step and the added bounce of using large hooks to Parrproof your flies.
For some of my own flies I use Gun brush made out of Rabbit instead of the hackle and dub routine.
Let me know how you Idea works.
I fish these on the swing with a twich , they really get slammed just yank and run.