here is the map I edited:
these are the changes:
- I removed ponds with fish
- I removed relics
- both players have 1 neutral goldpile (3 tiles)
- I placed 3 markets on Blue's side
I made a 200pop, 250pop and 300pop version; and civs are Teutons for both players.
Obviously the trade is not gonna be very long, but maybe that is counteracted by the lack of allied tradecarts that cause traffic jams.