That does sound simpler than moving the away fans, as long as City fans can be given regular/permanent access to ~half of the South Stand, with just the minimum required away capacity and only a narrow no man’s land. No more empty blocks in a prime part of the stadium.
We keep hearing that the difficulties are in the concourse underneath, but hopefully it’s not impossible to fix with a bit of investment (which has potential to pay for itself in increased capacity).
I'm probably in a absolutely tiny minority here.... but i don't want our away end to be paltry.... it massively improves the spectacle when there's 4000+ away fans.
Regardless of demand from City fans, i'd like to see our away end stay at 4k minimum.