Kolsch, IMO, is a fairly clean beer. I suspect they will all turn out well. The only ones I have doubts on are the tea and the apples.
I think the tea might be difficult to balance between too much and too little. The granny smith apples, green apple flavor is generally considered an off flavor from too warm a fermentation. But I say try it anyway.
Oh, and I think you'll like the results of using fruit over fruit flavor extract. Just remember to skin and destone before you add them.