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Cheers, SJS was the first place I looked but I missed the last one -that could be useful!
Expensive but works well:
https://www.sjscycles.co.uk/mudguards/problem-solvers-fender-flute/
If it's a steel fork you could insert a star-fangled nut at the bottom and use an M5 as a daruma bolt of sorts. As a spacer I used a cork.