Subpage on another domain

I have a Grav page where one subpage should be accessed from another domain. Which means if I, for example, go to domain1 and click on a link to the subpage, the user should see the subpage but not on domain1 but rather on domain2. All links on this subpage should however lead to domain1 again.
Is there a better way in Grav for doing it, instead of just copying the rendered HTML to