BTW: I may have just made a liar out of myself. I poked around a bit yesterday and discovered that nozzles for the E3D V6 hotend should also work in the Hexagon hotend. These nozzles are available in brass, stainless steel and hardened steel. Being the experimental type, I have ordered a couple and will try them out.
Note that I have no experience with carbon fiber filament. The hardened steel should work; however, the Lulzbot warnings about carbon fiber indicate that wear issues may still exist after replacing the nozzle. This may be due to the use of aluminum and brass in the rest of the hotend. I would suggest that you be ready to purchase a replacement hotend for non-carbon fiber work. Or adapting an all steel hotend for use on your TAZ.