Most big exchanges that deal with SEPA and other withdrawals rely heavily on kyc, it just wouldnt work here.
The way it could possibly work is weight votes against an already set mechanic on the steem blockchain.
A hybrid system that takes into account reputation and stake, for example. Pure 1 account/1 vote cannot work if you are unable to determine a bot from a person.

That way you create a system of where the community is the one that determines based on consensus how valuable your vote should or should not be, along with the investment you put in.
Ofc for this to work youdd need to get rid of bots.... Anyways. SMTs are coming, and i dont think the 1 account/1 vote will be as simplistic as it sounds.