Yes, and since unit bearing stubs are very short, you could take any old 1.31" diameter 4340 or 4130 blank and have it splined and threaded for UB use.
Seems to me, though, that most guys who are not doing the hardcore stuff WANT selectable hubs. Paul and Dave are not exactly DDing their junk anymore, so selectable hubs are a liability, especially the weak-ass 19 spline junk. The UB's have a smaller scrub radius, are lighter, and the stubs are stronger. This is not a good solution for 99.5% of the peeps on this site, though, including me. As I spend a lot of time in 4wd, at high speeds, and that tends to eat up CTM bushings pretty quick.