A couple of years ago I changed name on a category at PH.
I simply changed the name in the script, building a "newname/" category instead of a the "oldname/". The old page has been left as is and I haven't touched it for years and now it shows as nr1 on gggle for that keyword...
I say fuck 302...
Leave the old pages as is and send all onsite traffic to the new newname category.