I am with IO and A&C here generally.
I will climb on top in known icing as long as I can get into the sun. Once i am there the ice comes off very quickly. I have an excess of HP so I can carry quite a bit of ice on the climb without to much hassle. I will not fly when I know I have to pass through the CU all the time as the ice build is amazingly quick and if there is not enough clear sky time it won't come back off.
Unlike IO I will fly airways even on a short distance if it means I am above the clouds.
I won't fly when the freezing layer is below the MSA as it does not give me any room to get ice off that I picked up on the descent before flying the procedure.