> The obvious solution to this, a fully managed DHCP6 setup, does not seem to be well supported by dnsmasq

I'm using dnsmasq for DHCPv6 and it seems to work fairly well for me. "dig <device-name> AAAA" returns the correct addresses for my DHCPv6-supporting devices.

> but it wouldn't matter even if it was because so many devices don't support DHCP6, only slaac.

This should theoretically work with "--dhcp-range=slaac,ra-names" [0], but it doesn't seem to actually do anything for me.

[0]: https://thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html#:~:t...