I am afraid there isn't and even if there was something it would be against the rules.
In Lod I always had an empty low level char with a cube and moved all the flawless there. Whenever it was getting full I started cubing them which unfortunately was happening quite often. My suggestion would be to do the same. Take the decision to cube those gems manually and then just make sure to cube them instead of gathering them in a stash file.
In Lod I always had an empty low level char with a cube and moved all the flawless there. Whenever it was getting full I started cubing them which unfortunately was happening quite often. My suggestion would be to do the same. Take the decision to cube those gems manually and then just make sure to cube them instead of gathering them in a stash file.