It's all about what % of your workflow you want to be in analog domain. It is difficult to be a purist. Otherwise, shoot for the longest straight line, digitize with a modern sensor and learn how to use a computer. As long as the information is on the negative in some form, one can draw any toes/shoulders with a mouse. Which means that for a hybrid workflow you should care only about the range of the characteristic curve, the shape doesn't matter: I can straighten any toes and shoulders, compress or stretch, but its easier to make my own from a straight line.