Interesting, just brainstorming...

pick 10 of your top members
split the keys and passwords into 10 pieces
give them each 1/10 of the information
depending on trust levels all 10 could know the proper order
or you could have 3 others members that know "these are people 1-3/3-6/6-9" and a 4th members that knows who number 10 is
Else no one knows who the top 10 are not even the 10
and some sort of time released document is released, in a 1 year or so

to protect against the top 10 being compromised you could have them pick 2 or 3 people they trust in the community and tell each of them 1/2 or 1/3 of the keys and report back the people so everyone could be listed in the time document

you could even create a system where each member that now has 1 character makes a post or alters their steemit header to include the character so they could never hide the information, you would also have everyone else in the community do the same thing so the exact people and characters are unknown except to the very top circle and a time released document (this document would have to have some people hidden since the keys are publicly available if the order/members are established)