iA Writer Duospace is a great font based on IBM Plex. A new easy-to-implement idea to improve Dynalist for writers of short notes and long documents!
See iA Writer’s blog post about the advantages of a duospaced font over monospaced here here
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Thanks for the pointer!
It doesn’t look too different from monospace though, so I’m not sure if we should add it to the font list, given there are already quite a few choices. I’m sure you also know that more choices are not necessarily better 
The good news is that Dynalist will support custom CSS soon, which will allow you to load an external font file and use it.