You can also stick them in a room-sized microwave oven operated at rather low frequencies, to get deeper penetration into the wood and dry it from within. If yo

You can also stick them in a room-sized microwave oven operated at rather low frequencies, to get deeper penetration into the wood and dry it from within. If you do that with whole logs, you should be able to cut them to be straight in the dry state. This takes in the order of days, not years, without damaging the structural integrity by chemical decomposition that starts at relatively low temperatures. If you are in a hurry, you can also put something like burnt lime in the chamber as that chemically captures the evaporating water without releasing it in these conditions. That way you can keep the humidity under 5% during the process if you spread the lime enough to capture the water as fast as it is driven out of the wood. You need to be careful to not burn the wood, but you should be able to use something from FLIR with some computer vision to check that no lumber overheats. The water also increases the absorption a lot, so this provides feedback that equalizes the humidity, instead of e.g. a runaway heating that would happen if dryer wood absorbs more microwaves.