He is the sysadmin!
Boss wants names changes? Names change!
Now get to it.
Not happy? Write up exactly what the problems are, what the consequences are and demand feedback. Maybe propose to hire two "tuners" to do it during a week or so.
If boss still says go do it, go do it. It's not a fucking democracy.
Are we now at the point in history where sysadmins start to publicly moan about having to do their job?
If ithis kind of thing is difficult to do, then there is indication that a lot of base work has not been done yet.