A common currency to deal with! Gold! Yes! Sell your tech, reap quick bucks to get grains from a surplus nation! Makes sense. Now what will be the worth of the device? The demand would be high indeed, and not much of it has been supplied. Indeed a high price will be levied on the product! Nice nice. Negotiations won't be quick. Once it goes through, the kingdom will make a good amount of revenue from this!
Next chapter will be negotiations and possible breakdown in talks. After that will be a leverage our MC will get from one of the colleagues and finally a deal will be struck! Should be a small arc. Exciting!