I put the foil in larger squares to fit under the silver metal tubes used as offsets for the heated bed. I’m not sure if foil under the pei will work, my worry would be making the bed uneven vs just adjusting the position. I just remember getting under the silver tube things was a massive pain in the ass so I do hope the pei sheet idea works tho lol
If the work was already done to make the episode I think it should still be included. The artists and animators for it shouldn’t suffer because the thing their story was based on flopped.