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I can see that there's not been any extra input from forumers re possible solutions to your fork problem, unfortunately. My idea was that possibly the TT calipers could be designed to get the calipers closer to the tyres fitted to wheels, and so would be curved on their undersides give extra room for tyres to pass without catching on them. But I've had a look at one of the TT brakes I own and the underside isn't designed any differently from any other caliper. The main advantage of the design is that they can be compact little items and so more aerodynamic and powerful, but only when used with tyres having a tiny width. For bigger tyres (like you'd like to use- 25c plus), and forks positioning the wheel/tyre more than, say, 1-2cm below the underside of the fork crown the calipers just won't work. It's unfortunate for you though, as this idea could have been the last possible 'save' for your problem. The calipers seem to make it clear that it's not just these calipers that wouldn't help with the issue of using wider tyres, but the basic design of all calipers must be one where the designers don't think about the issue some riders have of using a fork that only allows minimal tyre clearance. So I don't think any caliper invented will help you out. Basically, what it boils down to is getting a new fork (or the brake adapter mentioned previously), and even with this option making sure the new one is correct in it's measurements.
walkmanman-
Thanks, yes I've been through very similar musings. I do agree that the fork has to go. For aesthetics, fit and personal preference it would have to be a chromium or black carbon fibre fork. I did measure from the inside of the fork crown down to the centre of the axle to around 34.5cm, while the steerer is 18.5cm long (approximates). But I'm not sure about the rake/curve and don't have a reliable way to measure it. I'm happy to sit out for a couple of weeks or even longer while I settle on a solution to the fork problem.
One thing I'm not keen on though is to get an off-colourfork and have it resprayed. Maybe if I had more time, money, passion, and spent more on the frame.
infmz
Quoting @walkmanman from my WANTED thread: https://www.lfgss.com/comments/17417419/
Your input has been valuable, but I wanted to shift the convo here to one place if you don't mind. I'm attaching pics of the brakes - which look like the TT-style that you mentioned. It's not just the caliper bolt nut that is hitting the tyre, but the caliper body itself. I guess new forks are defo in order...