Benefits (How this will benefit the server and game as a whole): Prevents marines from having to hunt for snow shovels on the surface and makes the machete make sense in the setting.
Details (Description of how you think this would work, the benefits, etc): Simply swap the machete for one of these:

Which gives marines a shovel to start the round with. It will have all of the same stats and values as the machete, besides being able to shovel snow like an ordinary shovel.
Implementation (Optional, if you have an idea how to implement it): Coding, spriting, etc. Just swap it out for the map just like the regular armor is swapped out for snow armor.