God I wish my brain worked like yours. Technically, yes you should be able to just split the contents of the capsule in half. In my experience, when I first started with Adderall I was prescribed extended release instead of instant I actually called the doctor to see if I could do this, they do not recommend but I think thats because unless you counted every minuscule little beads you wouldn't be sure if it was exactly half? I don't know, this is a pretty low, therapeutic dose so if it were me I would eye it and just take it with some applesauce.
Actually, if it were me I would take 4....but seriously do what you're doing, stay cautious, this is VERY good.