Originally Posted by
BoozyMcliverRot
Maybe I can make a disc tab that has a tail or fin that tapers down in height that extends about 4" past where a standard tab would stop.
I believe that is called a Willits style tab (not sure on the history). This will help but you still have a very flexible blade on the other side. I have seen instances where a builder will add a rib down the right blade as well to even out the flex but at that point, you're pretty deep into the project and you still have a 1" steerer that isn't well suited to disc brakes. Disc brakes are game changers from frame/fork design point of view.