Sorry, but that would be downright idiotic. Noone wants to camp and farm a named over and over AFTER they got finally their epic item, just to ensure that they can continue to use it. That is just mindless grind aka WoW that would turn off many people. :/
A better solution would be to use the master repair formulars with a few (or many) t6 ress like metal, stone etc. to repair the epic weapon. For the demon weapons make that SoG drops also repair formulars for each weapon he drops.
Or make generally master repair formulars like "Master Claw Repair" or "Master Scale Repair" to ensure that also the old legancy items are covered.