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It actually happens all the time. Each time something is changed to the basic off the shelf model, seats require new certification (can be 'minor' if it's just a special new fabric used or something or it can be extensive if something more structural is customized). And plenty of airlines order customized models of existing models (also SN). And in addition the cabin as a whole also needs to be certified again depending on what has been changed.
Btw SFD is in the proces of its cabin retrofit (it was partly stripped of its cabin anyway as a donor for SFC and SFB), that's not because LH still has to decide on which seats to put in there...