No offense, but yes. These are all official. The 3rd week of Numberblocks S7 episodes have been leaked on CBeebies and Vimeo and revealed figured out versions of 23 and 26-28. See inside for 27 and 28. 03/23/2021: Forgot to add 26's eyebrows. Oops! 06/07/2021: Added masked 27 from Season 8 and changed 23's arrangement.
Credit to Bluezoo, Joe Elliot, @cs458468 for the parts, Alphablocks Ltd. and Cbeebies.