You can use Shimano hubs and swap the QR axle out for a bolt-on. Atomlab makes bolt on hubs. Hope makes hubs that can use bolts. Halo makes hubs that can be converted to bolt-on. The Azonic hub can use a step-down thru-axle with nutted ends. Any thru-axle hub can use a nutted axle. There are lots of them out there.