ok... figured out Oculus basically got lazy with later runtimes and one has to overwrite files and use an older installer executable to trick itself into installing the newer SDK. Tested the DK2 with the SDK 1.3.2 and it works fine.
Installed flyinside pro 1.4 for OVR 0700 and it seemed to add a step in the self-install process (a good sign) and finished with a window to click to run when completed.
Now, I have a start error message:
Unable to execute file
c:\program files (x86)...\common\fsx\flyinside.exe
CreateProcess failed; code 740
The requested operation requires elevation.
I stood up but it didn't fix the problem.