Add different input for On Click event (UI)

Hello!

I'm currently working on getting controller support for my game, but I use the OnClick() events on most of my buttons. Is there a way to trigger this event by pressing a different button (on the controller)? I really don't want to change all of my buttons individually...

(I only hover over my buttons and never actually select them as I use a look input system with the Oculus Rift)

Thanks!