Now I'm wondering if it is a "legal" chess position to get the pieces to swap sides ... a solver to find how to do it would be amusing.
Obviously not possible -- how would pawns pass each other without captures?
Not what you asked for, sorry, but it reminded me of this gem - https://www.youtube.com/watch?v=C5JVFCouXIU
Obviously not possible -- how would pawns pass each other without captures?