I need Kernel Extensions for Karabiner and USB-to-TTY drivers to talk to and program firmware on embedded boards. If I can no longer do this, my next machine is

I need Kernel Extensions for Karabiner and USB-to-TTY drivers to talk to and program firmware on embedded boards. If I can no longer do this, my next machine is not a Macbook. Unless there is a different way, this is a dealbreaker.