Also as you note, this doesn't fit cleanly into any existing SUA
type for ARINC

Yes and no. The ARINC specification provides a "Unspecified/other"
category for restricted airspaces, under which the Luke (and other)
SATRs are described. For every rule there's going to be exceptions,
hence U/O.

The Part 93 components are going to be like that -- no doubt why they
are in Part 93. Look at the Grand Canyon airspace -- the only Class E
on the map you can't fly in.