Welcome to this Party Bigslug!
As to your #4 comment, the .22CCM has recently been made available by two or three Commercial suppliers so the ".22WMR CF version" is available nowadays. Not Cheap; but Available.
The .22WRF case length of .960" can be made from one of three ways now:
A. trim of a .22CCM;
B. make from .22 Hornet and trim to length; or
C. make from either 5.7x28mm or 4.6x30mm used cases.
Each has both good and bad points consider; such as the Tooling required to form .246"-.248" diameter cases from the larger diameter 'parent' case without excessive losses in intermediate steps versus the cost of a 'formed from .22 Hornet case .22CCM parent' that can be trimmed down in length but then may need inside reaming to thin the Mouth down to practical use thickness.
My own experiences with Forming both Hornet and 5.7x28mm cases down to .276"-.278" diameters Leads me to think the Hornet, having thinner base web and sidewalls, might yield a larger internal Powder Chamber Volume in the swaged down case than a 5.7x28mm case would.
For my experiments in making .25ACP lengthened wildcats the 5.7x28mm parent allows higher working pressures to be tried out as the Swaging process also work hardens the base further to make primer pockets more robust and last longer.
ADDED 20180428: The 5.7x28mm also has a Polymer coating that simplifies my Swaging process by Negating the need to "lube the Case" before swaging as long as I use multiple steps in my swaging. -- Chev. William
I think the use of .25ACP Brass to make this '.22 Ladybug' is a very good use as it yields a slightly more work hardened but higher net Internal Powder Chamber Volume case than could be made from Just swaging down and trimming a .22 Hornet case.
NoZombies combination of Swaging and Turning the case would probably yield an intermediate net Powder Chamber Volume between that of the .25ACP swaged down
and the .22 Hornet swaged down intermediaries.
Note: as to your final question; WWJMBD, I figure since he developed the .25ACP in the first place, he would 'roll his own' versions of the CF .22WRF and .22WMR and enjoy the shooting.
Chuckling,
Chev. William