Save yourself, and the snake, a bunch of headaches and just feed in the enclosure. If the only time you open the tub is to offer food then expect the snake to get used to this routine and be ready to eat. I seldom handle my nasicus and I feed in a separate enclosure. I do this because it gives me a chance to sift through their bedding for waste while they eat. They associate any sort of interaction with me as feeding time so are always trying to gnaw on my 10 little pinkies. If you want a tame snake, take it out once or twice a week(feeding day excluded) and you should be fine.

Hook training is typically used for animals with stronger feeding responses. All you're doing is gently tapping them out of feed mode or, in the case of a sleeping serpent, waking them with a room temperature object so they don't get defensive when a warm touch jolts them out of sleep. You don't need a hook either, just use anything that isn't your hand/arm and full of blood you aim to keep. Once they're aware of the situation, and have been conditioned, you can usually just pick them right up with your hands.