After all those years, I automated the most of the setup with #Ansible so it can be easily reproduced next year:
github.com/oskar456/ansible-op…
ansible-openwrt-ipv6-mostly/ipv6day-omnia.yml at 4f4ccc1bf725642ab5f6c8f2c65344357b2ffd08 · oskar456/ansible-openwrt-ipv6-mostly
Ansible roles for running IPv6-mostly and IPv6-only on OpenWRT - oskar456/ansible-openwrt-ipv6-mostlyGitHub