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@Archie's_Grobags
The last problem is simply clearance as others have mentioned.
A lot of track forks have very tight clearance.
In order to allow tyre clearance, the plate will need to be pretty thin, which increases flex.
A front brake can exert a lot of force, which will flex this plate and give poorer braking power.
This can be helped by keeping the plate as close to the crown as possible obviously, but again, there are several types of crown with differing widths, which means you'll need to allow for the widest.
There may also be an issue with the plate 'rotating' slightly under the crown.
Not all brakes pull evenly on both sides, either due to spring tension or poor setup, or wonky wheels, or uneven pad wear etc. Again the braking force and vibrations due to flex in the plate could possibly cause some slight rotation and hence brake rub.
Slight rotation back n forth could lead to loosening.
Just trying to cover all eventualities. :]
This could again depend on the shape of the front of the fork crown.