Thank you everyone for the infos.
GadgetGirlIL from the link you posted it seems like the Baryak Mules need mounting holes, or am I wrong? Are zip ties enough? If zip ties are a good option that could be a simple solution, but I have the feeling they wouldn't hold for long.
staehpj1 I found
this fit kit that seems to be what I'm looking for. Though I don't know whether that's suitable for carbon forks, and also
I live in Europe, so ordering from overseas might be a bit of a hassle. EDIT: They have a European website, and they do have front racks for forks without rack mounts. The question about carbon forks remains. I might ask them.
djb Mine is a gravel bike, not sure about how much weight it can carry, but the gears are quite light (30-36 being the lightest ratio)