If you want to heal a chop site there's a few things you can do to speed it up :
1. Allowing gross growth above the chop site. Resources moving past the chop site is essential for callus to form.
2. Buds popping at the sides of a chop are also beneficial and provide 'localised' healing as opposed to global or whole tree healing in the case of #1.
3. Use a very sharp saw. Clean up the edges of the chop with a sharp knife, eg grafting knife, box cutter. Seal to avoid dessication. If possible, cut from leader to a back branch. This serves 2 purposes : it keeps the chop point at the back of the tree and out of sight. Secondly, the back branch will serve as a 'point of energy' for the tree, ie it should not die back beyond it.
4. You can use the Ebihara technique and chop in stages. See MarkyScott's excellent 'Ebihara maples' thread for more details.
5. Do not expect a tree growing in a bonsai pot to heal a major chop quickly. A large container or the ground allows max growth. Obviously, give it optimum conditions - lots of sun, water and fertilizer.
Unless you are a bonsai genius the van Meer technique is fiction. Just try it and see how long it takes for you to swear.