Question I have (which falls in line with the above, with the noble's troops starving in a region with no food):
I used caravans not only for trade, but to carry excess food "just in case" I was stuck in a starving region, so my troops wouldn't be impacted...
If caravans have gone bye-bye, can something minor be created as paraphrenalia, so a noble can be proactive in protecting their own troops (maybe even to avoid impacting a region's food, because they already have their own)? If not called a caravan, maybe just call it a "supply wagon"... they won't be able to sell to a region (which seems to be what you want) but they can buy and store food (or heck, even loot food).
Does bring up an interesting idea though... spend 3 hours on "Forage Food" if you want to see if you can get food for yourself, into your supply wagon, but doesn't damage the region's production, and isn't considered a hostile action against the region...?