In the beginning of our club, we created a "Code of Ethics" and also a set of club bylaws. These can be used to oust people from the club (they were both finalized about a month ago, so we haven't had to enforce them yet). Although we haven't had the problem of mix-breeding here (well, maybe some Tamasken "variation" people, but they have no interest in our club or breed), we have had some other issues...but everyone is given a clean slate at this point, since there were no legally binding club documents prior to ours for the breed. If anyone messes up now, and we are aware of it, they will have their membership terminated...though unfortunately, this has no effect on their relationship with AKC.
At our core we have a board of 5 members who make decisions on voting people out, and takes on judicial duty if people violate the code of ethics or bylaws. We also have different types of membership - full voting rights are only given to adult CSV owners residing in the US, but non-owners as well as owners/non-owners can have non-voting membership and be fully involved with club activities. We plan to have a health testing scheme as part of our code of ethics, as well as a mandate on no cross-breeding. Maybe it is worth it for your club to look to other clubs (as we did!) - both CSV clubs in other countries, as well as "successful" (in terms of ethics and health) parent breed clubs within the UK. I would think the KC might be of some use also once they realize that there are serious people who are in things for the right reasons.
Here are links to our club documents, if they might be of some help:
http://www.czechoslovakianvlcak.org/codeofethics.html
http://www.czechoslovakianvlcak.org/...nstitution.pdf