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

the star fangled nut isn't going to be rigid enough i wouldn't think.

this
is a refined design of your idea. which would work much better i would think.

btw, DMczone, you never cease to surprise me with the things you know/have.

Truly great thinking... and also what Oz says, those SFN's can be little bastards...

I suspect the forces on the SFN/s would not be in their strongest direction (vertical pull).

2 or 3 would help like you say - also testing might show that they really are strong enough, I like the whole idea, but I would be tempted to avoid the SFNs - and use something with much more contact area with the inside of the steerer.

I know that you really love your quills, especially as we are not in a mtb forum here, but they are old technology. There is a fundamental difference in what quills and ahead sets are used for, it's not interchangeable: the quill concept is characterized by providing a *height-adjustable *locking mechanism.
This is not needed/wanted in a brake mount. Please keep in mind why the starnut was invented and how it works. When ahead sets came up, you were in need to replace the torque that is provided by a very large screw on a normal headset, to basically clamp the whole steering set.
That's definitely a higher force than the quill force that does not clamp anything, but just tightens itself into a tube.
A starnut actually 'cuts' slightly into the tube and can't be moved back even without tensioning it, let alone when there's tensioning applied.
A quill just lives on its friction and won't get stronger when pulled and might have the danger of being slowly moved out of its hole due to frequent sudden brake force shakings.
**
What's correct** is that the force applied onto the hanger piece itself needs to be adequately redirected into a linear pulling force on the starnut to avoid a non-linear pull.
This can be done by having a little stem-like piece as in dmczone's image, but then adding two double-starnuts in a row. This way, you got it all. Including full tensioning of the piece against the forks.

A word about quick mounting/demounting: think about when you would need that, I can only think of two situations: a) change from track to street and back or b) change from brakeless to law-complying.
With the starnuts already in there, a setup change would be even smoother than a quill. And if you ever want to completely remove the starnuts: yeah well, then take a suitable steel tube and hammer 'em out through the top. Takes 10 seconds.

jetski