I take your general point, but part of Voldemort's character as we have seen it is that he is Crazy Prepared, building in failsafes and backup options and safety margins well beyond the reasonable minimum. He is not merely capable of dealing with whatever challenges the narrative throws at him; he is comfortable, even leisurely, in the manner in which he deals with them.

He can't use magic on Harry, so taking them means reducing the size of the death eater guard by 1 or more during the time needed to take those precautions. If you don't know that Harry can do previously unknown to the world wandless magic, than that might actualy not seem like a good trade off.

I doubt the cost of temporarily reducing the Death Eater guard from 36 to 35 is greater than the benefit of a given precaution.

Additionally regardless of if its is actualy a good security trade, it's totaly in character for the kind of mind that made horcrux number 107 to think that it needs gsurs number 32

I don't understand this sentence. Would you mind rephrasing?