About crafting an Epic Drop - would the original enchantment be lost, or are you wiping it clean and adding a different enhancement altogether?
Depends on your crafting level and how much gold you are willing to spend.
You can have the choices of doing whatever you want with the epic drop.
The most extreme would be to completely modify the design, and Adding completely different enchantment in addition to the original enchantment the item has.
It won't make sense to wipe out the original enchantment because that will make the epic loot lose its original purpose.
This will be super hard to do, and cost an INSANE amount of gold, but hey if players wanna Min-Max their character, this is an option they can do.
It also makes crafting very legitimate and feasible. It will make crafters proud of their work instead of having all their crafted items superseded by the next tier of epic loot.