I don't have a dumeril, but for what it's worth, I've always heard that they are very docile so I think taming down won't be an issue. Regarding hooks, I suppose you could use one just to manipulate a bit, but "hook training" to avoid accidental feeding response bites need not involve an actual hook. I usually use a paper towel tube to just gently tap/touch him the moment I open the viv. The idea is to condition him to associate being touched like that with the absence of food. Viv opens, snake thinks , "oh boy food?" But then, "wait, I'm getting touched with a thing, There's no food".
However, if you really want a hook, you can get a 24" mini paint roller (the kind that take the skinny little 5" roller covers) for just a few bucks at the hardware store. Probably save a bundle over snake hooks at an expo.