I haven't worked on an Aleppo pine in some time. From what I remember, severe cutback produces juvenile growth. This makes bonsai creation difficult. Some people leave the trees juvenile, others, when working with larger, older material, may be able to train the trees with mature foliage.
I'd say try decandling and see what happens - Aleppo pine are vigorous growers.
Will be curious to hear from others who've worked on Aleppo pines over time.