I feel like you could fix this by simply choosing not to copypasto stuff? Instead of trying to make it so nobody else can copypasto their potions? Because my sims have more important things to do with their lives than either sleep or slave over a cauldron all day, and I like copypasto potions.
I used copypasto for my Wiccan (hope I spelled that right) to set up her gift shop full of her flower arrangements and home made produce and remedies and knitting.
Didn't realise that when staff restock the shelves, anything produced with copypasto can't be restocked. Instead you get a pile of ash.
Visiting as a customer I wondered why the shelves in my lovely Strangerville shop were covered in ash piles with customers complaining.
Oops.
