Just a thought: I used a crude snorkel made for one of the Italian-made FFMs back in the 1960s. It was literally chrome-plated copper pipe with soldered elbows. The "valve" was just a copper pipe cap with a gasket held on the end with rubber straps. I'm not suggesting that you copy it, but the function of a snorkel on a FFM was invaluable. IMHO, modern FFMs are nearly useless for shore diving even with any of the available ABVs, they are great on boats though.
I know you have a lot of devices competing for the two "sockets" on both sides of the second-stage socket in front, but I think a snorkel would increase the market for the mask. I've used almost all the FFMs over the years and must say that the Spectrum looks like it has great potential. Ideally, a FFM snorkel would have a mushroom valve for intake only and exhaust through the regulator. That "should" reduce fogging, dead air space, and improve air/water separation.