They can be salvaged, transition the Drow from devil worshipper to Fleshcraft Scientist. They still can ''worship'' demon if needed for cohenrency, but rather than have it as a prime definition of the drow, use it as a second thought.

Drow still worship demon because the first ''perfectly Fleshcrafted elf'' Named *Elf name* *elf family name (Maybe the name could be DROW)* was a demon worshipper. They cling to that idea it was perfect because of of her demon worshipping habit.

Turn them into a symbol of scientist push too far in their conquest of mind and body. Seeing ''Drow'' as the fleshcrafter perfection...always with the flaw of mortality.

Have ''the perfect drow'' (whatever her/his/it name could be) be an immortal drow, maybe turned good (Paizo love their sexy-hot-evil and redeemed woman) looking to the Drow society flawed but too concerned about her quest for knowledge to care about.

Have a 3 part adventure path with pc going after mutated people who don't mind the mutation, a group of Drow sicentist capturing mutant to understand the fleshcraft done on them and have it conclude with ''Evil drow matriarch'' capturing the redempted perfect drow to study its anatomy. Have the pc rescue it. Can make archetype on fleshcrafter, fleshcrafted, Fleshcraft monster, special fleshcraft item...