I find that if you have patience it all works out. Seasons one and two I forget it, season three I repot but dont cut the roots much, just give it more soil to grow and bring it out in the sun and chop back the candles early, so around now. This then causes more needles to bud back and they are still spring candles, this gets me some good growth. Season four I start the design.The only flaw I can see with the theory of throwing it in the back corner and forgeting about it is that it will put on extrended lengths of growth and I will loose what ramification I already have plus the foiliage my shed too far from the trunk for me to cut back hard. How have you found this scenario when you have used this technique?
Squizz
About 10 years ago I lost three JBP to disease/poor watering/going on a three month holiday etc etc. I stopped doing bonsai for a while, I started again about five years ago and did so mostly with starter trees. With two exceptions which managed to survive. I have started styling two of these this year. (one was at the AABC in Melbourne)
I like Jow idea. I have tried this before with the "Lions Tail", didnt give me as thick a trunkline but certainly helped and I have an elegant line for a bunjin.
I personally have trees in various stages. So perhaps you should "style" this tree for now because you have invested in its design. Then go and get some starters and plant them in large boxes and FEED them. Leave some untouched, maybe turn them around once or twice in summer. Use the "Lions Tail" approach on others. Three years time you will have a whole different set of design questions on these other trees and you will know what works for you.