I wouldn't worry too much about that ported design issue. If you've already got an established design, all of the design variables have been taken care of. The only additional build issue is installing the port, which is a LOT easier than installing a driver. Also, many drivers are better with a port than without. I'll have to look up the ranges, but the "rule of thumb" is based on the Qts of of the drivers.I am looking at getting a coaxial driver someday too. To replace my Recession buster kit speakers.
I've heard the loki is very good. Though I prefer a sealed design over a ported. Ported seems to bring a lot of variables to deal with. Sealed just requires you get an internal volume. Damp, brace, and you are done.