i would respectfully, mildly, dissent. I would suggest that any green, healthy leaves are essential to keep. That being said, brown dead leaves are not only not doing you any good, they are also retarding the possibility of new growth between said leaves and their source branch or trunk.
If it was just collected, its roots need recovery time, and will not support a hard cutback. I would advocate for removing all non-healthy leaves, and then a very mild pruning on those same branchlets, I would identify any possible locations for nascent buds, and prune back to maybe a centimeter beyond them. In doing so, you will not be wasting the stored resources on having the tree trying in vain to reconstitute the damaged end growth. Rather, you will be inviting the tree to produce new growth without the shock of a hard cut-back, which it is probably too weak to sustain. I would also seal any pruned branch bigger than 3 to 4 millimeters with Top Jin or something like it.
I have done this already this spring with two azaleas, one domestic landscape variety and one small satsuki. In both cases the trees seem to have ‘jump started’ new vegetative growth, which may in turn result in flower buds by fall. Also, since in the process of collection you have inevitably lost many fine root hairs, I would be misting twice daily, root-watering sparingly, and foregoing any fertilizer until autumn. At that time I would fertilize with something gentle, like a 50% dilution of a 10-10-10 kelp extract or a similarly dilute fish emulsion, from the autumnal equinox until your likely local hard freeze.
I would emphasize that this is only my own experience, in my climate. The task right now is to restore the health and vigor of the tree. Sculptural pruning can wait until that has been accomplished.