Very handy, thanks for sharing.
When I used Apple Reminders, I archived my completed reminders/actions with an Apple Shortcut that would create all-day events on my calendar from the completed items. Each item was logged on the date it was completed. The format I used was:
[x] Name of action (project name)
In this setup, each project was a list, and contexts were specified using tags. I found it great because once a project was completed, I could simply run the shortcut and then delete the list from reminders. My log of actions (and their associated projects) was easily accessible in my calendar, which was great for tracking progress during weekly reviews and billing clients.