I get where you're coming from but wouldn't being a proper peer on the Internet imply that you would need some kind of backbone access and be an ISP yourself?
All it takes to be a proper peer on the internet is a public IP address.
Randomly reusing the same limited set of IPv6 addresses would help privacy a little.
Fortunately there is another alternative, which is to get your public address from somewhere other than your local ISP. Some VPN providers offer a static IP or you can set up your own VPN to a VM on any cloud host and forward incoming traffic back over the tunnel.