There are a few comments including this one that describe a feature request that your solution doesn’t address. Your solution shows a useful workflow for creating subtasks, but it doesn’t show how to create a new task out of a comment.
One idea is to be able to use the dropdown on the right of every comment, and select an option like “Create new task.”
Would you mind creating a new Product Feedback request specifically for the comment-to-new-task idea (and voting for it!)? The title you have here is good, and I like your idea.
If you can incorporate anything else into your post that’s great, or I could potentially merge posts from the old thread there if appropriate.