Tailscale includes a statically-linked binary for arm.
Included in this is wireguard-go.
Out of curiosity, I downloaded it, untared it and ran it.
Tailscale works on xperia 10 II. !!!
So I can now connect to and from the phone from any of my devices, and I don’t actually need to use wireguard directly.
The binary is at
Use Tailscale on - select ‘Other’
Select ‘Stable Release Track’
Select (for Xperia 10 II) https://pkgs.tailscale.com/stable/tailscale_1.22.2_arm64.tgz
Try it out!