For an experienced modder it is probably pretty easy to add other troops no matter if it is a village raid or just a village visit. I am not able to help you with this though and can only tell you that others should be able to help you if they are willing.
Create new entry points with the scene editor, then add guards there with set_visitor in the "village_center" submenu of the "village" menu. No txt tweaks, module system only, before you ask.