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Had the exact same problem, except the hole for mine was underneath the fork crown. The bike manufacturer sold a 3D printed alumide bracket which I wasn't happy with. Got a friend to mill one from aluminum, a bit thicker than @Albb 's, but I wasn't too happy with it either (not sure I even tried it tbh, it needed some additional work with a file that I never took the time to do).
Very happy with my solution (not my work, got that done by a local framebuilder), which looks exactly like the one in your pictures :
I like it better than simply having a bracket, as having a third fixation point for the mudguard is super useful, and the wires run neatly inside the "rack". Haven't mounted my Edelux yet, still waiting for Son to restock on their coax cables unfortunately.
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These style racks would look great with the SON edelux protection cage from SVEN Cycles
For the All Road I got these Ritchey fork which I adore, but I am pretty annoyed that the threaded insert for mudguards is on the back side of the fork crown. Came across this mini rack which is a pretty clever solution I might copy. But I am not sure I need a rack. I just need a place to put my dynamo light to begin with.
In relation to dynamo lights it looks like the rear light for lost in mail :(