DR Pure Blues guitar light gauge are pure nickel and have a .032. They're 38" total length. Might be long enough for a high C. If the ball end is too small you can use a small washer or thread the string through an old bass ball end.Thanks!
I thought about it because both are nickel-based, roundwound, and have a round core. But probably a .032 would be a better fit for the balance. However I didn't find any .032