The mid-fork or fender eyelets won't work for mounting a Wald basket. At least not without some serious modifications.

The struts have limited movement capability at the basket side connetions. They're meant (as someone stated) to go straight down from the basket to the axle.
Additionally, the mounting holes at the axle side of the strut are huge. Big enough to fit a standard 9mm axle bolt, which is almost twice the size of a standard 5mm rack/fender mounting bolt. Even the head of that bolt would slip right through.

Swapping the axle is really not a difficult job, it's just tedious. Slide the QR skewer out, and unscrew the cone assembly on one side of the axle. The entire axle will slip out with the cone assembly still fixed on the opposite side. Be careful not to lose any bearings.
Take the new solid axle and screw the cone assembly on, using the still assembled one as a guide for how far to thread it on there. Replace it into the hub, and transfer the remaining cone assembly from the QR axle onto the solid one. Adjust the pre-load tension (see Park Tools website) and tighten your locknuts. Done.
Or give your LBS $5.00 and they'll do it for ya. The reason for the nutted axle is to remove the possibility that the QR cam clamps the strut improperly leading to injury. There's no wrong way it's going on there with a solid axle.