Hmm... No porting. How about windows, past the freak porting? I'm thinking three windows for half the length past the freak insert, then three more windows for the other half of the barrel, offset like 60*. Going for the most airflow without compromising structural integrity.
If you have the tooling and it's not too much work to deburr those areas so it won't affect accuracy, please quote me on a 14" black CCI barrel with freak boring and the above modifications (price of barrel included as I do not have one). If this sounds like something you could do, I'll send you a picture of what I have in mind.