Propagating black walnut and black locust...

 I need to take down some saplings that are growing in inconvenient places.
One black locust one black walnut.
I would like to propagate these trees from cuttings because they are too big to dig up.
I have read that black locust will just grow from being stuck in the ground.
Black walnuts seem to need more care.
I'm already trying to root other cuttings by sticking them in moist potting soil and covering them with plastic to promote humidity.
Leaves are removed, till only one, or none remain.
This technique has shown some success in the past.

Please, weigh in and share your techniques for propagating from cuttings.

I do not know much about the black walnut. However the black locust could also work from root cuttings since it’s suckers when the roots are damaged anyway. It will likely try to grow back or send up suckers if you just cut it down and don’t remove the stump. If it’s only A matter of wishing it was a few feet further in one direction you might be able to just cause it to sucker there by digging down and hitting the roots. I know some larger trees can have roots out around 10 feet or so.