Commander Path Bonus: -5% Global Unrest (btw: how about some stat increase per x levels for each different path? maybe -1% Global Unrest per level for Commander Path or a Commander Sub-Trait)
How about a Campaigner line of Traits? (I think this matches a Commander who is good at unrest reduction re: keeping order, and money injections, but if you have a better name go for it!)
Campaigner 1: Cumulative -3% Global Unrest, One off bonus of 25 gildar.
Campaigner 2: Cumulative -3% Global Unrest, One off bonus of 50 gildar.
Campaigner 3: Cumulative -3% Global Unrest, One off bonus of 100 gildar.
Campaigner 4: Cumulative -3% Global Unrest, One off bonus of 200 gildar.
Campaigner 5: Cumulative -3% Global Unrest, One off bonus of 350 gildar.
Adjust the numbers as you see fit, but I think -5% Global Unrest for the Commander path and a cumulative -3% Global Unrest per level of Campaigner (or whatever the trait line is called). If you wanted, you could have a Gold Rush skill after Campaigner 5 (or at the end of the Gildar income trait path if not there already) that just provides a big one-off bonus of Gildar without any unrest reduction. Maybe call it Benefactor?
And I would strongly that each Path has its own stat bonus for different stat/s per x or y levels, or have some sub-Paths that provide a specialisation stat bonus per x or y levels (if you didn't want all Champions from the same Path to have the same instrinsic per x or y levels bonus).
What do you think?
EDIT: I agree with the suggestion to balance the unrest reduction based on map size.