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For solution 1 - I don't have any guidance on what is wrong.

For solution 2 - I don't believe Floating IPs and NAT are implemented for V6

I think you should pursue solution three. It should work. I suspect you may have some type problem in your configuration setting. Two specific things to check. Unless i am not following correctly the user subnet seems to be named two different things in your command strings. "ext-sub6" for the VMs and "user-sub6" when adding a router interface. Also confirm that the router got a good Ipv6 address from the public network to use as a gateway.