If you were going to deal with all Markdown individually, then that would be even more complicated. However, there is a trick that can be used. In fact it’s one I’ve used before that involves the system clipboard.
Last year I posted an action in this thread that worked for an entire draft.
Here’s an enhanced version that I think works for the entire draft, or just a text selection when there is one.
It creates a draft version each time it is run, so you should not lose any content - but, please do reassure yourself on this. Give it a try, and let us know if that gives you a workable solution.