Ya you should be fine. I kind of want to know how this turns out because I'd like to do the same thing. I grow my own stevia. Some people say it has a funny taste though but I like it. Remember it's several times sweeter than sugar so don't over sweeten the cider.
I made my first cider batch with stevia and added corn sugar for bottle conditioning.... And took second place in a competition with it. If I'm not kegging my batch then I always go the stevia route.
I'm interested in the sweetening attribute of Lactose, and looking at Stevia and Splenda as possible alternatives. For adding body I can use maltodextrin, oats or a combination of the two, no?