There are posts in General Discussion and on Discord discussing how to go about making a "foreigner" settlement. The gist of it is that it is far easier if the "foreign" is nearby rather than far away.
Depending on how advanced sea travel is by KoE or Exposition, seacoasts may allow greater range for foreigner settlements to be established, especially by seagoing people. This is only my opinion, because it has never been discussed by SBS.
I also want to play a particular tribe, so I have not purchased an Aristocracy package. It also helps that I don't want to be bothered setting up and running a town. I plan to live in a town, so I've purchased stuff that is intended to make me an attractive citizen prospect for a mayor that meets my standards.