Cool, a great example of a modern building problem. Sounds like she wants it the old way - so why don't you supply her with "the old way"? Frame is purely functional, spend NO time on finishing details, your challenge is to supply a fast, but stout frame. That is a fun exercise if you are used to the typical polished timber furniture usually produced. We figure about 50% of our time is spent on "finishing", that time should be saved in this case - go fast!
Incorporate vertical nailers every 1-2' for to attach lathe strips. Most of these buildings also had very few knee braces to work around, but she'll need enough to meet code.
You know how screwy dimension lumber is now, that will bring about its own problems.
Are you thinking about it too much? Let her decide if it costs too much, she may choose to trade off something else and keep your framing if budget rises, especially if you're working well with her and present accurate information for her decision making. You have a unique chance to recreate some traditional building elements, go for it. Sell her on the value of that. Good luck.