Morningstar MC6 has PC Scroll Up and PC Scroll Down. You can set a range which allows you to scroll through a subset of presets. One way you might use the commands is to use ‘Press’ to scroll up and ‘Long Press’ to scroll down, both on the same button/switch.
Using CCs 52 & 53 to emulate FS4 & FS5 does preclude using external footswitches, you can still use the port for external expression pedals.