Nathaniel Suchy:
Is there a way to switch my current relays to use offline keys and invalidate the old keys without losing current stats?
you can switch between the modes (OfflineMasterKey 0|1) but to get the best out of it, it is best to start with fresh masterkeys that never touched an online system
(that means, creating a new set of keys and loosing the "history"/reputation of the relay)