Let us please not consider something so crass as drugging him. I've already threatened him that if he doesn't make a decision to go visit a source of his issues himself, soon, I'll just toss him through a gateway and make him visit, anyway.

And yes, I'd imagine there's methods, but none are so precise or guaranteed as what he's capable of doing for us.

And materials are better gotten now, but I'm sure if he were asked, he'd rather use the material to revive other Barians, instead of creating a new Scythe.