Just try it and see what happens. Just put in a little reflex and test fly, and see if you like the results. If not, just take it back out.

One thing you can do is use a straight edge to check the aileron alignment as it is now. Place the straightedge on the top of the wing, so it touches the TE of the aileron and rests on top of the wing. If there is a gap between the straight edge and the wint at the aileron hinge, you have reflex. Now flip the wing over and do it again on the bottom of the wing. If you have a gap here, you have droop. I've never seen a case where droop is a good thing, so at the very least, make sure the bottom of the ailerons are a straight continuation of the bottom of the wing.