Take a deep breath and try again.

You applied your strategy for subtropical plants to your J.squamata (against
advice) with results that were so maddening you cut the top out.

Nobody advised me against treating the J. squamata as a subtropical. Many
growers in this country keep it indoors for part of the year.
The reason I cut the top off was not horticultural, but purely a styling
reason. The style was not developing the way I wanted it. The tree is quite
healthy.

Now you want to apply this to your 'Shimpaku' (also against advice),
although it is now doing what you want of it.

The Shimpaku is the way I want it as far as style is concerned. But junipers
are slow growing. If I could keep it dormant for six weeks or two months, and
then grow it under lights for the rest of the winter, its development would be
much faster. Although the basic shape is OK, it is still a baby.
If someone with 40 years experience tells me I can't give this treatment to a
Shimpaku, I will follow his advice. I just want to know why. And I would like
to know if there are other junipers which will also thrive on the shorter
dormant period and 3-4 months under lights.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)