I think it would be great if we could copy and paste hex codes straight into the game instead of trying to memorize them and switch back between the game and desktop. This would make the character creation process 100% easier, at least in my opinion.
You should already be able too, the clipboard of the game is with the OS. Are you on Windows? Or are you on Mac/Linux?
Try running the launcher as admin, it doesn't do that by default. Will also make the game launch as admin.