How about you are able to set yourself to trader status (for lets say, week minimum?)
While in trader mode you can hire troops for cheap, with basic equipment (medium) ofc relatively more expensive as you try to hire more. You will not be able to carry any equipment and any additional troops from yourself, just goods n gold. You will not be able to attack, and going back to normal status will take effect 3 days after changing.
Would make easier trade for the independent traders...
It's a rather odd suggestion, but you get the idea...