I'd just get new brass nipples.
If the nipples are actually disintegrating, I'd replace them one at a time. Else, back the tension off the entire wheel and replace one at a time.
BTW, I'd hit the spoke threads with a wire brush to clean them up and use a lube.
You still probably won't have the "feel" of a new spoke when tensioning, but it won't be as bad if you didn't.