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Edit: sarcy comments have already been made.
You could use one of the kcnc thingys attached to one of the mounts.
Personally I would do that thing spotter(?) did using a headset spacer, bolt and headset end cap. Can't find it, but hopefully that makes sense. Or else get creative with a canti hanger
they're usually alu, so should be easy to tap, etc.
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If you have a mount under the fork crown, just use a normal light mount, might need some bending but works.
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I've got one of these https://www.instagram.com/p/BWQa40UBMBA/
from this dude
whats my option to mount a front light if my (carbon) forks dont have a front brake hole (disc forks)?