I would have thought spoons would work well for a turgo, I believe someone did a design with plastic spoons, that seems a bit dodgey but metal ones should be fine for small nozzels as long as you can fix them on satisfactorily.
For a pelton you would have to cut flats on them and braze them together in pairs, messy but still possible.
If you could get them stamped out with fixing lugs in place of handles then I think you would be on to something.
Flux