Ok so the real question is whether or not edo-tensi duplicates eyes.
if it simply restores the body why wasn't Nagato resurrected with his original birth eyes.
but we can asume at the point when edo-tensi was activated there were atleast 5 rinnegan existing at once: madara had 2 and obito had...
Easy but requires multiple people (kishi loves teamwork anyway)
1. Kamui a FTG seal to the other dimension
2. Teleport there (its a space/time nin-justu so that shouldn't be a problem)
3. Attack him at the same time in both dimensions
4. after killing him teleport back to another FTG seal in...