Rodney/LaMont Cranston/The Shadow:
Assuming that you live in the eastern end of Nebraska...........................
You might try the Signal 88 folks, especially Trevor Thrasher at [402] 498-8494.
They do have Defensive Rifle classes, among other such defensive and tactical courses. They don't list a Defensive Shotgun course, but they may (a) have a DS course that isn't listed or (b) know of one offered in the area.
[Frankly, I'd just point the muzzle in the Perp's direction, let loose w/some #4 Turkey Loads, and run like hell before the smoke clears.]
Also, Shawn Whittington at the Bullet Hole (402 596-0367) may either offer a DS course or tailor one for you. Shawn's a full-time EMT, so he's seen lots of gore on the streets. I've taken two or three of his tactical courses and have always gotten more than I paid for.