I really like this. Have messed with the other forms of this approach over the years but this looks like the simplest. My need is to create a tool that makes easier for people to quickly throw together presentations from some boilerplate and some code, screenshots, links etc. This looks like 80% of what i need. For anything more sophisticated i would use mkdocs which i already use.
BTW i prefer to use typora for my md editing. Its (so far) the nicest tool with which to work in md directly on windows. I use MOU on osx, and downloading macdown today.