Yes, of course.
Climb and cruise mach number is the same most of the times for a given company CI, so all we have to do is switch the reference to Mach number manually when this particular mach number is reached, or switch back to speed if the FMGC switches it on its own before reaching it.
It is only I would like to know exactly how the system works. I don't like seeing a table in the FCOM that I don't know how to interpret.