You can use a single seed and simply reset the event triggers after each forsaken battle with console commands. The only event you will get will be the Eikthyr raising the creatures of the forest which is a free supply of boar and neck. But first see if you can follow the suggestions already given and build a good base with a moat and high wall. If you invest the time, base attacks are pretty much neutralized with the possible exception of drake and bat events.