Demons Punishment Finale Question (Patreon)

I have a question for DP Finale, I want to use Zara's updated version for the finale. I was thinking of adding this whole time Zara has been using shapeshifting magic to appear as a human. But now that they have all been captured the monsters put a magic collar on all the girls to stop them from using magic. With this it causes Zara's spell to stop working, turn back into her true elf form. This way I'm able to get Zara's updated version into this series in a semi natural way.

What are your thoughts on this?