Thats nice idea!Great stuff!
That said I have been hooked to trading since Warband, one of the main things I see missing is more pronounce regional trade goods. For example Furs/leather from the north, spices from the south, silks from the east, and oil from the imperial lands. This created viable trade routes and I feel like this has never made its way into Bannerlord properly. I should be able to buy spices (we need this trade good) in the south or silks in the east and be able to get sick profits in the north or west (Vlandian lands).
Caravans - Having caravans should also provide passive trade experience, it was in the description they did this plus it would be worth the risk.
Guilds - Maybe down the road there can be trade guilds and trade guild membership. Maybe this could be a requirement to start a caravan or to own a workshop. It is too easy to start up an enterprise/trading company. Maybe a minimum trade level and fee is required to join the guild before the player can buy a workshop or start a caravan.
Anyways those are my thoughts and keep up the great work!