Honestly just one way would be way too centralized. But one way to use ALL the ways, thats a good goal and its been met, evidently or so I learned today in other comments here on this post, with the Hive All In One Auth tool. I am investigating it as we speak.
RE: HiveSigner, Hive Keychain, HiveAuth or Enter Your Key On A Site??? (later entry: PeakLock - see update inside about that oversight)