Add a new dynastic rule to the ruleset. Call it “Neutral Ground” and give it the following text:

“The Palace”, “Inner Slum” and “Outer Slum” are locations that can hold Migrants and other resources, whose contents are tracked separately from any Baron.

A Baron may expel a Migrant from his Stockpile to the Inner Slum at will. A Baron with seven or fewer migrants in his Stockpile may donate two Coal or Wood from his Stockpile to the Inner Slum to move one of the Inner Slum’s Migrants to his stockpile. A Baron with seven or fewer migrants in his Stockpile may donate one Stone, Coal or Wood from his stockpile to the Outer Slum to move one of the Outer Slum’s Migrants to his stockpile.

As a communal weekly action, Barons may Rotate the Slums. This action is atomic with the following steps:
* Migrants in the Outer Slum are removed from the game.
* Migrants in the Inner Slum move to the Outer Slum.

In the rule “Migrants”, change

No Royal Migrant may be an Unsettled Migrant, and such a Migrant is removed from the game if they ever become Unsettled.

to

No Royal Migrant may be an Unsettled Migrant, being placed in The Palace instead of whichever Stockpile they would otherwise occupy.

and

they must choose which Unsettled Migrants to move to the Dungeon Stockpile until they have 8 or less.

to

they must choose which of their Unsettled Migrants to move to the Inner Slum until they have 8 or less.