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I'm no lightweight at 70ish kg. On this there'd be loads of brake work.
I didn't have any hand problems on TCR. The one time I remember having hand problems from braking was in Gran Canaria on a long descent with maybe 25 hairpins. That was at the end of a long day ride, at the end of a week of riding. Been fine on a heavy tourer in the Pyrenees or off road in Albania, etc. It was the multiple hairpins that I found hardest.
There are people using rim brakes. I think Mikko is and someone else has mentioned it somewhere.
I would have if I had done it. But I agree, for this, discs would make sense.