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I don't think one is necessary since most lumber is already kiln dried and has sat long enough to equilibrate with outside humidity. Yes, lumber will dry a few percent further when brought indoors in the winter, but it will also re-expand a few percent higher when sitting around in the summer (or after being swum). This is the reason Mirror Coat cracks (no stretch). No amount of sealing will stop this....it only can slow it a touch.
If you want to know if your plug blank is at equilibrium, just weigh it, wait a week, and weigh it again. When the weight is stable, the plug is as dry as it is going to get for the humidity it is stored in.
Just to bother you more, a plug becomes oval when the humidity changes either way from when it was turned. Wood expands/shrinks more parallel to the grain lines (when viewed end on) than perpendicularly. I think you can reduce splitting in maple plugs by drilling your hook holes parallel to the grain lines (rather than across them) for the same reason.
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