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initial top balance can be done pretty easily with a bench power supply available for $150 or so.... it just takes a while. wire all cells in parallel, set charger to 3.8v (for thundersky/winstons) and let them go until amps going in drop to zero..... perfect top-balance.

I don't think you want to set to 4.0v.... you just need a little higher than you expect the average voltage your charger to brings them up to once you re-wire in series. You want to increase the likelyhood that they all hit the knee at about the same time, bringing the pack voltage up enough to trigger the charger into CV and finish...
 
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