Hi @Jeremy_Levy!
Not exactly the same parsing method you suggest, and not to discount the value of your suggestion which is a good one, but FYI some of what you’re asking for is available in the Hashtag Automation feature of my Flowsana integration. It doesn’t currently populate custom fields, but will let you set a due date (and My Tasks section), as well as assignee, tags and projects, all from the body of an incoming email, via the user of #hashtags.