I can imagine you could work around that issue just by once redirecting onto your own site first.

On the surface, sounds like a difficult problem to solve safely. On a related note, I often have the back button not work because I hit back and chrome cached a redirect to some other page and it immediately redirects again before i can even spam back again. Need to long press back to get a longer history to go back further.

This is a really interesting "attack" to see.