Well, but they still aren't radical in the sense that they want to empower poor people and do away with economic inequality, like Winstanley wanted

True!

Mackintosh of Borlum's fictional son as written by Naomi Mitchison is pretty sympathetic to the Quakers, isn't he—that's a potentially interesting thing (um, in Mitchison's imagination if not in real history), considering the seventeenth-century connections between the Quakers and the Levellers. Hmm, I want to read that book, though it looks as though it's still not available anywhere that allows download of the whole thing.