Just dry your old peat moss completely out and reuse it. The larvae and eggs die unless wet, and the adults only lay eggs in wet stuff.
Using BTi is just as simple as watering your plants, something you probably do at least once a week. It also eliminates mosquito larvae and cut worms.
Fusarium fungus is vectored by fungus gnats and is known to cause rhizome rot in Sarracenia and can quickly infect your entire collection.