If NAT64/DNS64 isn’t an option, setting up a small proxy server on an OpenWRT or OPNsense router might work. That assumes you have access to public IPv6; which at that point, you’re better off using said router to provide dual-stack internally.

It’s still a relatively new community, all things considered. I helped spin up a Discord for the r/ipv6 folks, else we’ve been trying to decide if we should have folks come here too. I reached out to the mod for insight.

Hey there! Yeah it’s me, from r/ipv6. Thanks for pointing that out about Cloudflare, I forget it can do that. And hope you are keeping well!

https://programming.dev/ pings over IPv6. Basically, any instance being hosted via Vultr should have IPv6 by default.