The more i think about it, the simpler it gets.
consider a total flaps and slats fault (flap lever control sensor unit fault, for instance).
You can reduce speed right away to VLS and set the lever to conf 2 and 3 at VFE next -5 kt. This will be symbolic, since nothing happens. In the mean time, PNF can calculate landing distance. VMAX is unlimited, because you are clean.
so in the end it is very straight forward: fly VLS and land the airplane.
In any other case you have better conditions, and you can also fly any speed above VLS. sometimes flap lever movement will be symbolic, sometimes it will not, but in the end it all comes to "fly VLS and land".