I made this generic template that generates a time-based planning template leading up to a trip or deadline. Simple text-based input for OmniFocus import based on TaskPaper Reference guide:
https://support.omnigroup.com/omnifocus-taskpaper-reference/
https://workflow.is/workflows/439d9f057fb94a99bb0873bfb89144b5
I have a similar Workflow for new projects. I used a Workflow from Rose Orchard to develop my version. Your Workflow is a great example of how to set one of these up. Anyone wanting to set up a time-based project Workflow for Omnifocus should use your Workflow as a starting point. Now, I wish Workflows worked in macOS!