I think "open holster carry" is a fantastic idea and commend you for it. Whenever and wherever it is illegal to exercise one's rights, I think people ought to do whatever they can to show their displeasure in the strongest way possible.
I have had the similar idea that in states where OC is banned that people should open carry those plastic replica "red guns" which look exactly like the real thing. If several hundred people all decided to do either of these ideas at the state capitol building in a mass protest, it might make a good news story ... especially if it was video recorded by a lot of people and put on YouTube.
Good Luck! Its hard to be on the "bleeding edge".
Police here in OK take the "I am licensed to carry and I am carrying" notification pretty well.
Is it required by OK law to notify LEO's that you are carrying if they stop you, or merely "a good idea?"