Why don't all those who want national health care voluntarily form a large insurance grouping and shop rates. It could be very large if all those who voted for Hillary and Bernie is any indication. Then we can all keep our freedom to choose what we want!
You could even get the Democrats or other like minded groups to endorse it!
If you like national healthcare why would this not work (besides legal limitations about groups/insurance across state lines)?
Actually I do think this is a good idea! I know that there is a Christian organization that does exactly that - it offers affordable health insurance to members. Seems to me any group could do this if it were big enough. I know GE also is self insured (or at least it was when I worked there).