I have a raw rosewood/ebony modern construction neck that I just reset the truss to dead flat (via the side-adjust only) and has sat face down on a shelf* for a couple years (soon to go back on it's strat body). I've checked it a few times and it's still flat and true. May not be the optimal method but I've been lucky so far!
* edit: on a shelf inside my house, not in the garage or a shed or something!
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