Actually, I would suggest a new wheel. If the rim has bent quite a bit, which would be the case with a bunch of lose spokes, you'll never be able to true it properly again. And forget about re-using the spokes and nipples. They will be prone to failure if you do.
Since you mentioned that you don't quite know why you fell, could it be possible that you fell because the hub broke due to a defect? Worth looking into, and you may get a free replacement wheel from the manufacturer.
The biggest problem is I can not find anywhere to buy these hubs (SRAM/SACH drum brakes). The original manufacturer is trying to source some for me but in the mean time I'm trikeless and unhappy.
Have you tried one of the shops that do tandems and recumbents, like Tandems ?UNlimited? in ?Alabama? (sorry for the question marks, but its been a long day and I'm tired of doing searches to check) or College Park Bikes/Mt. Airy Bikes in Maryland? They have a lot of similar stuff and big parts bins.
Curtis L. Russell Odenton, MD (USA) Just someone on two wheels...
