Maybe something like research into medicinal magical plants, for healing potion ingredients? It'd be a way to be sort involved with Healers without having to cope with icky things (do you remember that time I almost fainted when Eloise got a nosebleed? I just can't bear the sight of blood at all!) I'd have to know something about Potions, but it would emphasise Herbology more. I imagine that I'd have to try for a N.E.W.T. in both subjects.