Pictures and names of mask compatible liners would maybe help but I don't think the absence is why you haven't had any takers yet.
Full face mask users aren't as numerous here when compared to nasal or pillow mask users....so you have a smaller audience to draw from right off the bat. Then how many of those FFM users actually need or want a liner or even want to try one? So an even smaller audience there. Your target market isn't very large....at least among the forum members here.
Lets just suppose that about 1/3 of the members here use a full face mask (just pulling that number out of my hat) then how many of that 1/3 needs or wants some sort of liner? It's going to be a relatively small number and then how many of those people want to bother with testing something are reliable enough to give you some feedback??? People are generally lazy even when trying anything even when that something that is free.
Example....I love to try new stuff (and happy to give feedback about it) but not everyone likes to experiment with anything or maybe they don't want to compose any sort of review or opinion. I don't even own a full face mask so as much as I would like to try something new....it's not going to be anything that has to do with full face masks. It's just not going to happen.
Go ahead and at least list the available choices and every now and then bump this thread to the top of the main page to get attention to your offer.
And for the others who just want to chit chat.....don't mess up this thread with chit chat...please....thank you.