Using animations designed for ue4's epic skeleton

Kubold's first person melee animset is perfect for my game and I'm trying to figure out what it would take to import those animations and apply them to arms rigged to humanoid or generic in unity.

Unfortunately, he doesn't offer this animset for unity yet. only unreal.
https://www.unrealengine.com/marketplace/fpp-melee-animset

I'm willing to purchase assets like umotion pro and his animation converter if those help. What steps would I need to take?

 

did you buy the melee animset already?