Seperate redirection URL and initial page load URL

[manuel-rw]

We run an application that is onboarding the user on a special URL that is only valid once.
After that, the page will show 404.
We set STACK_MAIN_SERVICE_ENTRY_PATH to this special URL and the user is being redirected correctly.
However, it seems that demo-kuma is always redirecting to this URL if you reload the page completly after the URL has become invalid.
The user is being trapped in a 404 page.
It would be awesome if the URL for initial redirection could be different (eg. /onboard) while refreshing the page completely without redirect would redirect to /.