This is a little climbing system I made for a game I’m working on. I hope it helps someone out 
It has an actor component that can be added to any player character, and some spline meshes that can be climbed (pipe, ladder, ledge, and wire).
This was made in 4.18.3, and should work with any version at or above that (it was tested in 4.22 as well)
Thank you to CoquiGames who provided the Action Platformer Template, which gave me some idea of how to implement a climbing system: [FREE] ThirdPerson Action Platformer - Programming & Scripting - Unreal Engine Forums