Custom Header Nav for Mobile

Hello-

I was wondering if there is a way to create a custom header/menu for mobile scale… like swap out one BB header for another at a certain breakpoint.

I would even be happy with a way to deactivate the BB header so that at least the default header with the hamburger nav would display at mobile sizes. Here is the site I am working on: https://vswordpress.com/

Thanks for your help,
Jason