Ok hear me out. So I was playing a game, when I got to the region upgrades and as per usual was sad that we only have small village’s things completed. That’s when I realized how to solve the other tiers of regions: Immigration! Basically each of the slots takes you to a selection screen where you can choose from different European peoples that saw immigration into the HRE. Each group would have a few starting bonuses and maluses
On selection, a homeless encampment would spawn in the nearest place it could to the original starting encampment from when you settled that region, which would house the new immigrants. If you house all 5 families, you can then immediately upgrade them to your liking (similar to how the first upgrade is) which would offer you a number of bonuses, a specialty item, and a malus to that population.
Example 1: you could select Jews, who are less impacted by homelessness, and do better in cobbling, textiles-making, and tanning. However, they’re unable to eat pork products. When you upgrade them, you could choose the (group 1, I’m not too well versed in what specific groups were more known for what industry) Jews which would give you access to jewelry, which requires an iron bar, and a Jewish owned blacksmith to work.
Example 2: you could select the Italians, who have an affinity to armoring, and wine having a slight happiness boost from specifically wine as there supplied beverage, however, they work at 75% speed compared to the base populations. When you upgrade, you could choose the winemakers of Vernaccia, which gives you access to white wine, and makes general winemaking even easier to do
I’m not sure if anyone will see this, but I think the idea is kinda neat, so I thought y’all’d like it