I don't know if you saw this: https://surlybikes.com/parts/disc_trucker_fork
flat mount and 12mm thru axle steel fork either 376mm/45mm or 390mm/45mm
I hadn't, no. Very interesting - it's very similar to what I'm planning to do. Cheers!
@Brommers started
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I don't know if you saw this:
https://surlybikes.com/parts/disc_trucker_fork
flat mount and 12mm thru axle steel fork
either 376mm/45mm or 390mm/45mm