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You don't actually need to saturate the wood completely. The worms chomp their way to the surface when they're ready to transform into beetles, and any insecticide (or paraffin) there will kill them.
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Yes and no. When they are ready to turn into beetles they leave the wood anyway so killing them then doesn't achieve much. They will carry on eating and weakening the wood up until that point. I would prefer to kill them asap.
Here in France it was still possible to get solvent-based stuff the last time I looked but it's aimed more at the professional market.