If you have omniBACK/dataPROTECTOR in your environment, you could try the following:
Make a copy of your systems /etc/passwd file.
Edit the copy by associating your userIDs encrypted password for root's account.
Perform a backup of your copied/modified passwd file with omniBACK/dataPROTECTOR.
Lastly, restore the modified passwd file over the systems /etc/passwd file.
now log-in, using your userIDs passwd...no reboot required