So, that whole thing about finding some stands to get these speakers up to more of an on-axis position, I never found anything that would work. So I'm having Sound Anchor build a set for me.
They'll be 4-posters, 9.5" high. The platform will be 14.5 x 13.25, which is the dimensions of the built-in base of the Stirlings, plus a half-inch in both dimensions. They're going to weld a half-inch thick bar across the back to create a 1" high lip. This will keep them from sliding off if/when I experiment with adding some rake angle in addition to the lift.
The base of the stands will be 18.5" deep, and 16.5" wide. That adds a bit to the footprint of the speakers, which I was hoping to avoid, but it's not too terribly much. I have more space in the depth dimension, so it should be manageable.
Build will take about 8 weeks.