Proxy model

models.py

class Proxy(Page):
  """
  A general content type for creating links to existing pages
  in the page menu. Act as a placeholder for the first child
  page if no page is explicitely being proxied.
  """
  
  target = models.ForeignKey("Page", related_name="proxies", blank=True, null=True)
  
  class Meta:
    verbose_name = _("Proxy page")
    verbose_name_plural = _("Proxies pages")

page_processors.py

@processor_for(Proxy)
def proxy_processor(request, page):
  """
  Redirect to the proxied page. If none exist, try
  to redirect to the first child page.
  """
  
  target = page.proxy.target
  if target:
    return redirect(target)
  
  target = list(page.children.published().order_by('_order')[:1])
  if target:
    return redirect(target[0])
  
  raise Http404