I agree with your points but the answer may not be as easy as it may seem. Some points to consider:

How would your assigned district as a participant be defined?

Is it based on where you live? Should it be the same as how we define teams w/in a district? If so what if you want to change teams? This last one is the crux of the issue.

Maybe you have to be with your "team" for a certain period of time to be allowed in District X qualifier? We could see about getting the assigned district added & validity date to the label for our USA cards. To change that assignment we'd have to have a process for updating that and have a date associated with it on the card so it's easy to validate.

You have valid points which warrants further discussion.