You can look to use Tom Hayes in two ways.

One, out right the sacrifice. Don't let him know. Somehow get him closer to where the Bies likes to lurk. Obviously you can get him angry, or make him seem armed with a gun with no ammunition (not to be known to Tom).

Or two, offer Tom Hayes a choice. He can opt out of the deal if he can get your soul back. If he gives that back, send him packing with a promise (the more binding, the better) to never mention, allude, post anything about this place and to never come back. If he doesn't agree, then you gave him an honest chance and your conscious is clean. If he chooses to live and Aleksei gets his own revenge on Tom before he leaves the woods... well, then, I don't think anyone's heart will bleed much over that.

Right now, the knowledge Tom Hayes possesses is important to getting your soul back. But it won't matter much if the Bies destroys your home.