Why did he shy away from the belt? There are a lot of things to recommend the belt. It packs a lot of sting, you can use it to give a strapping of varying levels of severity, depending upon how hard and fast you apply it (you could, for example, use it lightly for warm up and then increase it as you go along). Belts vary a lot, and some are much more suited to light discipline, others heavy. Those that are narrower, for example, can pack a lot of sting, those that are wider and heavier, more impact. I have a belt that is very "broken in" and flexible, which my wife "got to know" somewhat, as you might say. I am sure there are many on this and other boards, who would view it as suitable for no more than a "good girl" or relational spanking. She has a low pain threshold, and it was quite enough for her.
Belts can add a significant emotional/psychological element. It is the "traditional" implement a man would use, so those who like the traditional, politically incorrect element of discipline might particularly like it. And if he uses the belt that he usually wears, you will see it on him all the time, a constant reminder of ttwd. And of course, the moment where he unthreads it from his pants prior to using it, adds an element of ceremony that you may find very nice (or at least, effective). Unthreading the belt, and then waiting for the bottom to undress to receive it, makes for a nice penultimate lead up to the strapping. These kind of scenes show up in a lot of spanking fantasy stories for a reason.
Of course, you have to be careful applying it so it does not wrap and reach areas you don't want it to. But the wrapping part can work for you if you use it to reach areas you want (having it wrap around the thigh, for example).
Sigh! I wish I had more experience using belts, as I find the idea extremely appealing. But we only used the belt a few times. For most of when we did discipline, it was hand spanking only. Implements scared my wife, and not in a good way. I did not mind too much, as I could hand spank her longer than I could use a belt, unless I went pretty lightly with it.