Why not use a more modern version of the flail tank used on the D Day landings?
It worked if I remember correctly on anti personnel and anti tank mines.
Funny you should mention it, 1,5 decades ago (last century) I was assisting some blokes I knew in making a compact-version of the "flail-tank" you mentioned.
The consept was supposed to be compact enough to be transported on a regular 8 ton truck/lorry, and be shipped in a standard 20 feet cargo container.
The solution included improved flails and off the shelf components assembeled on a Bobcat miniloader, primarly intended on anti-personel mines, but the rig was supposed to survive an anti-tank mine as well.
We had a lot of fun testing it on fields, digging through the top soil and sparing local farmers the task of plowing, the tests proved that the darn thing could negotiate quite steep slopes as well, but it took some effort to come up with the automatic control system to ensure that the flail dug in at a uniform depth no matter what terrain the machine encountered.
Shrubs and bushes was no problem, but trees took some time to chop throug.
They later did a live test on a Swedish testing ground, chopping up anti-personel mines with splendid apetite.
The Swedes was however reluctant to let it chew on a live anti-tank mine, so they concluded the test by setting off a charge of TNT similar to a mine under the cab of the vehicle.
Surviveability was proven, but it didn't matter much since the macine was remote operated by radio controls.
Later on the sendt a prototype to Bosnia, only to have it seized by a local war-lord.
Then they went down to Iran to field test a production model on ra real minefield, an effort wich was hampered by political difficulties.
Later on the also came up with an even smaller 4 ton version.
While the consept was quite sound, the whole project strandded on production costs, typical for small companies.
There's a video of the 4 tonner here:
http://www.novatron.no/video/video_logo.jpg