Byron -

Haven't had any problem with the hackle unraveling after just wrapping it down the post and then around the shank before tying it off. I've used the same approach for the 9DH on Duck's Green Drake and Duck's BWO, and a couple earlier patterns, without any problems with the hackling on any of those flies.

I don't see any problem doing what you are suggesting, but it isn't necessary based on my experience with these flies to date.