Brainstorm with me!!

[LD1]

A landplane dragging a piece of fence sounds like what you are envisioning

 

[HawkinsHollow]

A landplane dragging a piece of fence sounds like what you are envisioning

Almost. A FREE homemade landplane dragging a piece of fence is exactly what I am imagining.

 

[Bansil]

Grab a 4x4x1/4" PC of steel angle, draw 2in teeth on one side, use angle grinder to cut out teeth, clamp to bucket lip with teeth facing down and drill 5 holes in the uncut side to bolt to bucket and now you have teeth you can back drag with...

Look at the similar teeth on the Rake I'm building, bottom of this page
Rake teeth

I can take a picture of 1 I started on for my old tractor in a couple hours, very simple and minimal tools

 

[Jrasband]

A landscape rake is going to work best in my opinion. Once you get through the sod it will break up and move around dirt.

 

[Rustyiron]

Tooth bar?