An additional problem - the site https://lemmyverse.link/ is available only partially (requires VPN to work).

So my new idea is to deploy
https://github.com/RikudouSage/lemmyverse.link
into my website locally, and give 2 links - the relative (via local redirector) and the direct one (as a fallback).

the relative link on forein server will became broken, until they also install such redirector into the same path.

After that the link will always lead to local server and redirect to preferred server of user.