No , not a patch on a flail mower with hammers . A flail will suck up most of the remaining sticks and saplings and turn them to confetti , a hog won't and it will leave sharp stakes to puncture your tires .
This is a before and after of the same area I did last week . As you can see , there were thousands of smaller trees amongst these keeper Gums . Don,t expect a result like this as I can pluck a tree straight up out of the soil and then smudge the hole in the ground with the root system (using it like a big paint brush) . But you can see how tidy the flail leaves the site . As you can imagine there was a birds nest of leaves and sticks left on the ground after the tree extraction , but the flail sucked them all up and mulched it all . Pushing them over will leave divots in the soil but a bit of back blading with your rake will smudge them to an acceptable level . Don't forget , there are other options that others have suggested which may work well for you , but i think this would be your cheapest route which will also leave you with some handy equipment .