Grey Drane, Robin A Henderson, I understand it might be too late to comment here. Five years have passed. But I might have some good news to share.

"Desk for Medium.com" - https://medium.com/desktop-app is a desktop app and a focused writing environment for Medium. The Desk app not only extends the entire Medium experience to desktops but also brings some of the tools and functions that make other desktop writing apps shine.

I invite you to try it and see if it suits your needs!