A solution to NOT drill your track forks and have a normal front brake nonetheless

Even if you shove a quill style wedge up the steerer tube it's going to be better than just a couple of starnuts as it has 3 or 4 inches of metal before the wedge. The wedge will simply be holding the mechanism up in the tube.

If it's not a temporary brake, I'd go with star nuts on top of a wedge. I can see a star nut, even several of them, buckling due to heavy braking. A snug wedge'll stop it moving around, therefore stop any potential buckling, and with a star nut on top it'll stay put.

Ok, I repeat for the last time: still it seems to be not clear that I am already working on a next design that does **not **look like my image at the beginning of this thread anymore.
And, it does not matter at the moment if starnut or wedge or whatever. All of them, also the starnut, will be supported by a inner stem that sits snugly in the steerer tube for at least 30mm or more. *Then *there follows the starnut/wedge/expander/whatever. Like in dmczone's image.
What I am currently doing for the next design is finding a way to deal with wafer-thin clearance situations, that's more interesting.