Those hubs work great. I have a set of them laced to Sun CR18 rims (36h, 700c) that I use as a bang-up wheelset on my 29er.

The hubs are tanks, but they are strong, and I have had no spoke issues at all. On other hubs of this design (mavic crossmax/ksyrium) I have had issues of spokes popping out of their slot under extreme side loads, but not with these.

You are right, the axle is a 9x1mm which might cause an issue with the dropouts of your bike being made for 10mm. I think you could conceivably find a set of newer XT cones and run a 10mm axle like XT front hubs use, and the cone set from one, to be compatible with the smaller bearings Shimano front hubs use, and it would make a fine track hub.

Plus, your use of 6-bolt ISO mounting is FAR superior to track threads, you are right!