The stuff that
@bwaynef has offered is all about more advanced trees and is of little use to these tiny babies.
Your approach is very sound. It is what I believe the nurseries in Japan do to develop pseudo yamadori junipers now they are no longer allowed to collect wild ones and is also what I have been doing here to develop shimpaku trunks.
Take a thin cutting (I actually strike long runners to get this sort of stock) Wire the trunk. It does not really matter if you wire over needles or small shoots because all of that will be well gone by the time the trunk has grown. Bend and twist the trunk. Your 10" cutting is now only 2" or 3" tall. The more random and uneven the bends are the better as it will look less contrived when grown. Allow 6 months for the trunk to set then remove the wire. Sometimes the trunk is now too soft to support the weight but it will soon stiffen up. It will usually pay to allow the little tree to grow some more long runners. Wire and bend those too, even the ones you don't intend to use in the end because straight jins on a twisted trunk just doesn't look right and at this early stage you really don't know which is the final trunk line or branches and which will be sacrifice branches.
When you finally have enough basic trunk (which can take 2-4 years) you can them plant it in the ground. Don't try planting wired trunks unless you are happy to have scars and embedded wire.
some other hints: Try for some really tight bends as well as the more relaxed ones I see on the trees above. You are aiming for really random so need a mix of all sorts of bends and twists. If you an't get really tight bends initially go as far as you dare (expect a few breakages while trying) then allow the tree to relax for a day or 2. You should then be able to bend even further and tighten up some bends. Twisting the trunk as you bend will also allow far tighter bends than a straight bend. Allowing the trunks to dry out a little before bending will make them far more flexible.
Initially I had difficulty bending close to the roots. Wiring the just rooted cuttings when they are bare rooted at potting on solves that problem and you can wire right from roots to tip and bend before potting them up.
Bark tends to slip when the trees are growing so expect some dead sections if you do this in summer. Bending in late summer or winter is safer.
I do have some failures using the above. Tight bends will cause the occasional breakage and if that happens to be low on the trunk it can well kill the tree completely. I have since come up with an alternative approach. Instead of taking cuttings, wire the long runners on your developing trees. Now it doesn't matter if some break as you have not invested time and effort into rooting cuttings. They will also grow faster with the resources and roots of a larger tree to support them. When the shaping is done just layer the good ones and you have well developed twisted trunks ready to go in the ground or grow pot.
Definitely keep on with the wiring and twisting of these little junipers. Anything is better than straight trunks or those terrible corkscrew semi advanced junipers.