Thanks for going to all that trouble, but those are all the cloth "rag doll" style...
I'm looking for the poseable PVC "action figures" with removable clothes, more in the style of the Palisades Muppet Show figures.
I wish I could embed pics on this forum (hopefully that will be one of the rumored upgrades coming soon) because the links to the Wiki take you to a page full of merchandise, so I know that's a bit confusing.
But after a moment it will isolate and enlarge just the photos of the PVC Bert or Ernie. At least that's what it does on my end.
I've got "knickerbocker bert" and "knickerbocker ernie" as Saved Searches on eBay, so I'll get email alerts if anyone lists them by manufacturer.
But the 'naked' Bert figure that I found on eBay last week was listed without the name Knickerbocker anywhere in the description. The info stamped on the torso only says 'KTC' (Knickerbocker Toy Company?) so some sellers may not know to type in Knickerbocker.