Fun anecdote - I once needed to sort some nested items in a big yaml file. After spending three minutes trying to understand sort-regexp-fields (or some other function), I cheated - I ran org-mode, and then org-sort and then went back to yaml-mode. So stupid, yet so brilliant. Why the heck would I ever want to use "first-class IDE" or "intuitive, plebeian editor" if Emacs has anything I could possibly imagine? Right at my fingertips.
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¹ https://github.com/agzam/org-edit-indirect.el
² https://github.com/thanhvg/emacs-hnreader/
³ https://github.com/thanhvg/emacs-reddigg
⁴ https://github.com/agzam/slacko.el
I want that. Can you give some details?
A search finds modeverv/markdown-to-org which looks 80% there but activates based on a yank or converting an already loaded markdown buffer. Perhaps it can be made to apply on opening a .md file.