If you brought back Nocturnal Sect, you could actually play any healer composition. SGE/SCH is already a powerful combination, especially with even minimal communication. Right now you can't reasonably run WHM/AST together since Savage (and the entire end game frankly) has just become repeated mit checks with very little raw healing requirements. Noct Sect AST would pare nicely with WHM and be an incredibly unique shield healer.