If this can't be fixed ASAP (ie in a patch tonight) I recommend using the typical software testing approach. You take your test server (You do have one right?) and configure it to pre-patch. Apply the new patch fixes one-by-one until you see which one breaks the class. Mark that patch fix as bad. Take the main servers down for emergency patch tonight. Roll the configurations back to pre-patch (configurations not character data so nothing is lost). Apply all the patches except the one you marked as bad. Restart servers. Problem solved. Find a different fix for the patch that caused the issue.
