"but when push comes to shove, the cultural customs, or whatever else you want to call them, of ethnic/cultural minorities have to work within the framework of the country in which they exist, and the laws of that country, their environment, in other words."

You are right, thats why its a good idea to make a formal change and have us recognised as the social minority that we are.

As far as the mechanics of doing this, we are at the beginning of a long process with this, it wont happen overnight, we are raising the issue within the community, getting opinions, ideas and suggestions.
Also the idea is getting through to the media, we have had interest from some, and getting views from NTs too, most seem very keen on the idea, which is a pleasant surprise.
Throughout the process we can raise awareness and continue to educate.