I've completed the new Kingship system and included it in the latest Beyond the Black Gates 1.2 playtest PDF.
Kingship allows Level 5 characters to purchase or claim strongholds, raise armies, and defend their realm using a simple mass combat system that fits on a single page.
I've also added an invasion generator to create seasonal threats, from goblin raids and orc warbands to Tier 3 monsters that threaten the realm.
I hope this gives your party something new to spend all that gold on!