Oh this is actually a pretty decent idea!

Just dig deep a deep enough hole that it won't be able to escape then lure it in.

Bonus points if you dig the hole down path from a creek then drown it, it'd have to be a pretty big hole though.

Once it's stuck in the hole just tie the knife to a long stick and poke away.

Maybe sharpen a bunch of sticks and have them at the bottom of the hole so when it falls in it at least fucks it's feet up or possibly is impaled depending on the size of stick.

Idk I'm starting to think fuck the knife, just give me a shovel, a month may be steep for such a big hole but I've done enough digging for a living to know it's possible, if you're motivated enough.

bonus: alternatively, dig relatively small holes everywhere so it breaks it's legs