To do a swap like that you need to choose a player on a team that you would want to make your second driver. It can be done, but since everyone plays different teams its hard to make everyone happy. If you have general idea of who you'd want to swap out it can be done. My mod added Claire Williams as a playable myteam/career driver.
To do the second part a specific team would need to be chosen to swap the face on an existing players AI. F2 driver for myteam or teammate for career.
Name on your teammate will remain as is. Unless you use the name change mod on cheat engine.