All the store-bought stevia powders taste horrible to me, unless I mix them with another sweetener. That’s probably why the only stevia I can tolerate is stevia glycerite - that is, mixed in glycerin rather than alcohol. The glycerin has its own sweetness that offsets the stevIa’s bitterness.
Oh, and we grew stevia for awhile; our dried and powdered leaves had zero bitter taste to them. Sadly, it took such a large amount of the powder to taste the sweetness that we abandoned that project.
Back to your question,
@Tammyfarms i think the issue with powdered anything is getting it to suspend in your balm and not feel grainy. The stevia glycerite would not be grainy, but again, it won’t mix well with the balm.
Hopefully someone else will have a good answer for you. Otherwise, I do find that peppermint EO can be fine on its own if you find one that is less medicinal and more sweet to start with, and you use a fairly small amount.