Thanks for your input. That is what I was thinking Pete... I am trying about 18" with my Adriatic, I had them (except for their tips) all semi wrapped in newspaper inside a box and inside black plastic bags...once they showed me their eyes to root, I planted them in large soda plastic bottles, rather than 'cups'. I continued the semi wrapping of their 10" exposed, so they would not dry out, I did put them laying down as I did not want them to shift. I put them inside the plastic tub and garbage bag for a while...and their tips started showing life, so I took them out of the bag, whoola, had roots, so, laying down in window they went, cover the bottles, so no direct sun light on them... the buds are trying to leaf. I roll the bottles once in a while - they seem OK.
Now, I have some 4-5 feet branches...with 3 -4 year old wood... so, I want to do the same - since that long thing is already 'bent in a 90 degrees, I think if it roots, I have a prompto japonese espalier. I am going to try... I have room in my basement for it, but it is not that warm there, so it may not root as quickly as it should. I may get a heating coil or pad for this experiment. shall report!