Finally got my hands on an Xbox Series X this week, and immediately started attempting to make Charles Barkley.
After about 5 hours, I have him looking really good. In the video below I go over how to make him, and also give you a great signature package so he plays like himself. He also looks really solid on the floor (So not just in edit player). I believe this will also work for the PS4, X1 and PC versions.

Just a quick hint: If you don't want them to use a nickname for Barkley in game (Like The Beast or something), import your created Barkleys appearance over an existing player on the roster. For example, if you want him on the all-time suns, you could put his appearance over Booker, followed by importing another players attributes, followed by tweaking everything for accuracy to fit Charles.
I am on PC, so I can use modded Barkleys, and even bring Barkleys over from prior games. However, this doesn't help console gamers, so I figured this creation could help out those on the most popular platforms (PC is still technically niche, Xbox and PS have way more users)
Let me know if you have any questions.