I would question why you would want deeper cuffs ....
The best shirtmakers - certainly not Tyrwhitt or Lewin - make a narrower cuff with rounded edges so they wont catch on your jacket as you move your arms. A deeper cuff would be more likely to catch and get in the way of any gusset button.Since you can only see a 1/2" of cuff when the jacket sleeve is properly adjusted, what's the purpose? If you are wearing French cuffs sans jacket, you are certainly in the minority.
The best shirtmakers - certainly not Tyrwhitt or Lewin - make a narrower cuff with rounded edges so they wont catch on your jacket as you move your arms. A deeper cuff would be more likely to catch and get in the way of any gusset button.Since you can only see a 1/2" of cuff when the jacket sleeve is properly adjusted, what's the purpose? If you are wearing French cuffs sans jacket, you are certainly in the minority.