I absolutely LOVE moss and I have been using it for many years.
The person I get it from has many varieties. He just keeps his carpet moss outside on plastic mats but not in a bright area and under a canopy. He has mosses under there for years, Just kept moist.
In my enclosures it does not last as long due to the light/heat but lasts about a year until I have to change it. I sit the carpet moss on sphagnum moss which is on top of large rocks half out of water. I spray the Moss every day. I dont have soil in my indoor enclosures apart from the potted plants but they are all topped with Sphagnum Moss. I also have mosses in my outdoor froggery which are still lovely and green that have been in there for over 2 years and I think they will be fine for many years to come.

I'm interested to see what you find Cheri. Great idea.