Wow! This is totally too much like work. Someone at the park is hand turning their entire plot. Or they are trying at least until they drop. If they marked out beds versus walks, they would only do maybe 60% of the work. Or they could cover the beds with shredded leaves, and let the worms do the work.
|And they have just started|
Here is one of my beds. Never been tilled. Leaf mulch and other organics applied on top. Volunteer worms greatly appreciated. Wood chips are added to the paths as needed. Every couple of years the chips are raked away and the two inches of great black soil created underneath is shoveled off to beds. Then the chips are put back down.
No till. Little toil. Works great for me. For more on No Till and Wood Chips, please see: