Use different wagtail page as root without slug

Question

I'm attempting to set a page as the root home page of my wagtail based site.

I know you can set the homepage using the sites setting. But, my use case is different.

I'm using a "redirect" page which redirects to an index page as the homepage. The index is restricted to only allow ertain page types (since it's an index....). But, this causes issues with other pages not being in the tree if it was set at the root.

Hence, the redirect. But, upon redirecting the serve view of the redirect page to use this page it picks up the slug.

I still want it to appear at the root url. Meaning, /. How can I achieve this?

High level description:

from django.shortcuts import redirect

class IndexPage(Page):
     # children restricted to IndexSubpage

class IndexSubpage(Page):
     # parent restricted to IndexPage

class RedirectPage(Page):

     def serve(request):

           # Link is a link to a page through a ForeignKey....
          return redirect(self.link, permanent=True)

So, this will pick up the slug of IndexPage instead of being at /