Hello there,
I'm a dedicated game modder and have worked on many GTA: SA mods in the past.
I can convert the skin for the player character (with the ability to wear clothes, get tattoos and so on), Also I can use it to replace another in-game character (like Sweet, Big Smoke or any other character you like so you can play alongside Franklin Clinton for example)
In either case the task should be doable (and rather fast and cheap in the case of NPC replacement) I will convert any skin to your satisfaction and provide an AUTO-Installer for it.
I can also change other in-game details ( Character names, Mission Icons, Weapon names, etc. ) to make the skin fit better
Feel free to message me if you have any inquiries about modding GTA:SA in general even if yo don't plan on enlisting my services :)
Best wishes,