You don't need to lose the points if cutting ACC's down. Just install the inserts with hot melt glue same as you would with aluminum arrows. Then all you need to do is cut the arrows down, heat up the end of the piece you cut off and reuse the inserts.

If you are cutting a short piece, shorter than the insert you can apply heat to the point. Take it easy here as you don't want the shaft getting too hot. Apply enough heat to the point that you can grab the point with a pliers and pull the insert out.