Fetching an IPv6 /64 delegation over a GRE tunnel

Dear all,

On the countryside, I have no IPv6 and it may be a good solution for speed and latency to fetch one or several IPv6 /64 from my server on the Internet having access to IPv6 delegations.

Server: Debian on the Internet with several IPv6 delegations.
OpenWRT router on the countryside.

Can it be dones easily? Is a GRE tunnel the solution?

Why not with wireguard?

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