my bet on the way to remove the curse is that Alice has to kiss the duke on a certain condition and at a certain moment, example : a true loves kiss under the full moon's light. (might seem cliché but it's just a guess)
@kozna Somebody stupid, yeah probably. Luckily for them, he's not the type to misuse his power even under drastic temptation. Unluckily for them, I doubt she's so scrupulous.