Does anybody have or know how to /script to change the keybinding for "Interact with Target"?

I need to:

1) Unbind "Interact with Target" keybind
2) Bind "Interact with Target" to "J"

I basically need to include these in a macro so I can disable the "Interact" function easily for my casters so they don't go running into the fray and meleeing ^_^