Here's my idea for the last few volumes:
The Three Stooges Collection, Volume 7: 1952-1954 which should include both the 2-D and 3-D versions of "Spooks" and "Pardon My Backfire." And a few pairs of 3-D glasses would be nice, too. This would be a great selling point.
The Three Stooges Collection, Volume 8: 1955-1957 which finishes up the Shemps and goes into the first year of Joes. Yes, another crossover collection, but the main picture would be of Moe, Larry & Shemp, with a small picture of Joe Besser on the front with the notation "also includes Joe Besser" just like they did for the Curly to Shemp crossover.
The Three Stooges Collection, Volume 9: 1958-1959 would finish up the Columbia Shorts and would also include solo shorts from Shemp Howard and Joe Besser.
The Three Stooges Collection, Volume 10: The Feature Films would be a nice way to finish these sets. It would include: "Rockin' In The Rockies," "Have Rocket, Will Travel," "Stop! Look! And Laugh," "The Three Stooges Meet Hercules," "The Three Stooges In Orbit," "The Three Stooges Go Around The World In A Daze," and "The Outlaws Is Coming." This could also include Joe DeRita's Columbia shorts as bonus features.
Now, is all of this too much to ask?