how can I assign and use different controller schemes for a single keyboard?

I'm creating a local multiplayer game in which 2 players use the same keyboard to input controls. I have created 2 different keyboard control schemes for the players but I'm struggling to find a way to assign each player character a different scheme and how I can only effect the player's character who inputted their relevant controls.

This is the first time I have (attempted) to create a local multiplayer game so any insight on the best way to split and use different keyboard inputs for 2 players would be greatly appreciated!

Thanks!