I'm not sold on a crucifixion in the heavens, but of course that option would resolve the conflict. I suppose you mean it's not the only way to resolve the conflict.If there is a problem of reconciling Romans 13 and 1 Corinthians 2:8 then I doubt if it is resolved by putting the crucifixion in the heavenly regions.
Do you have any specific example? The "princes" of Greece and Persia oppose Gabriel and Michael in the sky. They don't manipulate political events on the ground as far as I can tell.However such angelic/daemonic rulers are, almost certainly, as part of their job description, the spiritual forces behind earthly power structures. (See the later chapters of Daniel for this idea of the heavenly princes of the nations.)
I've certainly heard that interpretation of Paul before, but I get the sense it's mostly a way of reconciling Paul's spiritual language with the more concrete scenarios presented in the Gospels. Again, we run the danger of a circular argument if we insist on a specific historical scenario Paul must have had in mind — one unattested in any Christian literature or historical record before or contemporary with Paul — and use it to draw historical conclusions.