I am sure simple solution can be implemented that would void exchanges taking advantage of our LLC. Something as easy as an automatic process where coin holders can sign messages that they own that wallet. Just like the shareholder have had to do so far. As the technology advances in cryptoworld it is becoming easier and easier to secure your coin and provide proof of ownership.
As socoban told before, that does not work.
Because the owner (or someone else with access to the exchange wallets) could sign messages like any other normal Karma holder.