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If I remember correctly, you remove a number of cards from the core set each time you play. Why not just use a couple of those remaining extras to create the asymmetrical start these promos provide?
Designer of board games with a bite...
That would certainly work.
There is one disadvantage, one player could end up with a card with two fields, woods or water next to each other, thus having a clear advantage.
Of course you can rule out these cards (though that slightly changes the odds - for all players, so no big deal).