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Haven't tried this, but it looks to be theoretically possible.
Have a look at the man pages for the useradd program. You can specify a UID and GID as options. That may mean you will need to first remove the existing user. But the files he owns should still retain the same UID/GID.
Then just change the password to what you're using now after you have added him.
Warning: Test this first with a user and files you don't care about! (i.e. create a test case.)
You could use vipw to change the username in the passwd and shadow files, then rename the home directory to the new username. If you don't change the UID in the files, then the user permissions should "automagically" change.