I've heard of people drying their wood by placing it in a black plastic bag and turning it inside out every once in a while.
The idea is that the black bag will warm up causing moisture to escape the wood. Turning the bag inside out will let the moisture escape and the wood inside can dry further. Weigh it from time to time and when it no longer loses any weight and little or no condensation is found in the bag, your wood is dry. I use the word dry, but not seasoned. That takes time and can mean more stable wood in the long run as it acclimates to your surroundings.
I believe that this is a safe way to get rid of extra water because while inside the bag, the wood is still in a moist environment.
Regarding walnut moving a lot when drying, do you generally mean the wildly figured examples used for knife handles or general run of the mill walnut? I've air dried a couple large trees worth of eastern black walnut with very little movement. It didn't have much figure except near the base and in crotch regions, but even these behaved fairly well.