MDAnki produces a file with a deck for importing to Anki. Every new import will generate new cards. I don't know anything if it's possible to make updating cards during the import. I'll try to investigate it. Thanks for this note!
There's a somewhat similar project[1] that lets you use Org mode to make cards. It uses Emacs so there may not be too much you can apply but could be useful to take a look at.
[0] https://github.com/FooSoft/anki-connect [1] https://github.com/louietan/anki-editor