You can add Hope to the list of hubs.
For 26" parts becoming hard to find, think your being overly concerned there, the battle for the 3 wheel sizes is far from over, 29er's could be on there way out after 26" if 650b takes off, regardless, apart from rims / spokes / tires, there are no major difference between the hardware used between any of the wheel sizes, anything that can be used on 29er/650b, can be used on a 26".