Welcome to the Team David!
Over on Team Camaro and Team Chevelle the guys are buying new Ford Mustang four speed humps and modifying them to fit their cars. They use a hump only to fit a console in place, and it isn't a drop on and weld but requires body work and fabrication skills to get it to pass for a Chevy hump. I have never tried it and aside from reading posts have no idea of how it works or even if it will work with an Impala console. In my day I didn't worry about consoles just cutting a hole big enough to give my Hurst Ram Rod shifter enough room to work and covering it with a monster size Hurst Super Boot.