An Aimpoint is much quicker than a scope for target acquisition. Due to eyesight considerations, iron sights are out of the question. I did pro tournament paintball for a few years and a scope is not what you want when you need to shoot quickly.
My thought here is I would only go with one sight system, whichever one you prefer. The more you add the more you have to figure out, under stress, which one do you use in one situation over another? Too complicated for me.
Im also curious how well the Aimpoint will work under stress at close distances without a good cheekweld? its pretty high up there and above the bore axis...