The Frostfall Dev Kit is now available to mod developers, which includes the FrostUtil API. This is the same set of functions that Frostfall itself uses in order to do things like get / set the player’s exposure, determine the current temperature, and more. Using this, you will be able to ensure a deeper level of compatibility with Frostfall without a direct Frostfall dependency.
Edit: Frostfall 3.0.3 was released, along with an updated Dev Kit with 20 new FrostUtil API functions. See the API docs for more info.