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I'm not too familiar with VPNs that offer IPv6 addresses, so I can't help with that. But I'm curious about why some people want IPv6 addresses. Are there any benefits to having an IPv6 address?
https://ipv6now.com.au/primers/IPv6Reasons.php
Basically, Legacy IP (v4) is a dead end. Under the original allocation scheme, it should have ran out in the early 1990s. But the Internet explosion meant TCP/IP(v4) was locked in, and so NAT was introduced to stave off address exhaustion. But that caused huge problems to this day, like mismanagement of firewalls and the need to do port-forwarding. It also broke end-to-end connectivity, which requires additional workarounds like STUN/TURN that continue to plague gamers and video conferencing software.
And because of that scarcity, it's become a land grab where rich companies and countries hoard the limited addresses in circulation, creating haves (North America, Europe) and have-nots (Africa, China, India).
The want for v6 is technical, moral, and even economical: one cannot escape Big Tech or American hegemony while still having to buy IPv4 space on the open market. Czechia and Vietnam are case studies in pushing for all-IPv6, to bolster their domestic technological familiarity and to escape the broad problems with Business As Usual.
Accordingly, there are now three classes of Internet users: v4-only, dual-v4-and-v6, and v6-only. Surprisingly, v6-only is very common now on mobile networks for countries that never had many v4 addresses. And it's an interop requirement for all Apple apps to function correctly in a v6-only environment. At a minimum, everyone should have access to dual-stack IP networks, so they can reach services that might be v4-only or v6-only.
In due course, the unstoppable march of time will leave v4-only users in the past.
Telstra (Australia's largest telco) now provides IPv6-only to mobile handsets by default. They've deployed 464XLAT.
Vodafone/TPG now implements this too. It's just shitty old Optus that's stuck in the past.
Optus is barely an internet connection at this point. I'm using about 10 fearures on Aussie Broadband that simply don't exist on the Optus network.