I hav'nt thought it all the way thru but is'nt a vacuum or lower atmospheric pressure the opposite of what you want, after all they don't vacuum treat lumber.
If you are trying to achieve maximum penetration, I would try and minimize the water content of the wood by drying it further than air dry. You could use a food dehydrator to accomplish that and then use a pressure vessel of some type to treat the wood with sealer.
I think i just thought it thru.
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