Your location is Hawai'i is pretty ideal for a few of the items I really like in my vivs - especially is you want to grow orchids, too.
In my experience, "carpet" moss tends to be a bad neighbor for orchids - it will grow into and over smaller orchids and generally become a nuisance especially for Pleuros which like it moist... but, without moss, who wants to have nothing but bare wood between orchids?
In my case, I have found an ideal companion in Gonocormus minutus ferns. You can find this stuff growing thickly on tree trunks (especially near streams) on the wet side of all the islands - it is quite common.
For me, it grows slowly but thickly and gives the same "green carpet" effect of moss but without the takeover problem. I really can't recommend it enough. I would happily wave a wand and replace all the mosses in my viv with Gonocormus if I could.
I addition to Gonocormus, the mini-liverwort that tends to dominate moist, deeply shaded areas on the islands is another great carpet moss alternative. It is not as well-behaved as Gonocormus, but it is still preferable to carpet moss IMHO. I envy your access to an infinite supply of both! It almost makes up for the other ag controls that make getting new plants a challenge in Hawai'i.