I have a custom system in place for IPv4 to update AWS Route53 based on this script[0] which I could easily extend to update my AAAA records at the same time, but I prefer a stable IP address. Dynamic DNS (v4 or v6) has a tendency to break down for a time whenever the IP address changes until the old records have expired from resolvers' caches.

[0] https://willwarren.com/2014/07/03/roll-dynamic-dns-service-u...