I was thinking about the stewardship approach. There are some really useful features of that, especially around the long-term management. I've been in situations where the long term was neglected for a decade or two, and then oops, capital repairs needed and no capital. So that's important stuff.
How would you connect that to the mission of the congregation? If the stewardship is for the sake of being careful with the money and not tending to the mission, then it can end up being stewardship for safety and not for action. Where I see this mindset being particularly powerful, though, is if you can tie the stewardship to the mission, so you don't end up with high-risk low-discipline mission people yanking at the doors.