I just tried to save a colony by getting everyone to caravan off the map. However, they spent all kinds of time dicking around (not gathering anything) and just got killed.
A mod, or pointing me to a mod that makes it so when you have a caravan that is only colonists and maybe an options-enabled list of items to include, forms a caravan as quick as possible and leaves the map (preferably away from enemies).
What I would do in this instance, is form a 1 person caravan, and wait until they start moving to the edge of the map. If they are moving in the wrong direction, then cancel the caravan and reform until they are heading in the correct direction.
Then draft everyone else, forbid all items on the map, add them to the caravan, and then undraft them.
I believe this would solve the problem without the need for a mod.
Caravan Journey Spot
https://steamcommunity.com/sharedfiles/filedetails/?id=2370637341
Caravan Entry Spot
https://steamcommunity.com/sharedfiles/filedetails/?id=2551332489
So many mod's that allready change some caravan behavior.