I've been thinking about this, and have concluded that while formal C17th scribal hands are a nightmare, the handwriting of the just-about-functionally-literate was likely to be a lot easier for the modern person to decipher, on the basis of my acquaintance with a large number of manuscript household recipe books of the period - the kind of thing you can find online here (http://wellcomelibrary.org/about-us/about-the-collections/archives-and-manuscripts/digitised-recipe-books-project/).