I think my point is ultimately this: if you're seriously afraid that people will vote for a far-right party in sufficient numbers that they will end up exercising considerable power, to the extent that proportional representation (i.e. accurate expression of those people's will) is undesirable, then the society itself is badly broken for whatever reason. You can postpone the inevitable trainwreck for a while by suppressing that vote or rendering it useless, but ultimately you'll lose that game anyway, except that all that anger will get released over a much shorter period of time.
I don't have an answer as to what to do with such a society, though. Especially when you're on the inside.