Health belt? Wasn't it used for Restoration Belt or smth like that? I mean, it combines with mana belt. If the restoration belt was used for another synthesis... i think so, but i'm not sure myself...
You know, i'm not good in that kind of thing, so i'm not sure myself, but to open the campaign map and see for yourself is that difficult?
Oh, and just saying i'm sure about the combination of the belts, but i'm not sure about the name of their combination. Life belt, restoration belt, regeneration belt, there are lot of items in the campaign and i often mix some of them.