I don't think it can be done in two buses - X26 to East Croydon and then the 468 to Elephant & Castle doesn't really count as E&C is a boundary point. There are several three-bus possibilities (e.g via Shepherds Bush and Hounslow) but although the Hopper is no longer restricted to one change, you probably can't get from Zone 1 to any suitable second change point before your hour is up.