You don't need to generate your own. The Battle Brothers subreddit maintains a living list of "God Seeds." Here are five standout examples for the Warriors of the North and Blazing Deserts DLCs:
Players generate seeds to optimize:
If your seed does not spawn a settlement with a Hunter’s Cabin (which provides Hunters, the best ranged background), you will struggle against Hexes, Necromancers, and Goblins. A seed generator prioritizes seeds where ranged characters are abundant. Battle Brothers Map Seed Generator
Note: Always ensure the tool matches your game version and enabled DLC/expansions. You don't need to generate your own