That's a good and broad mix of topics. :) Shortly thought about submitting the "breaking of the 4th wall" one myself, it gives you a lot of possibilities how to do it.

"A minor or original character must step up and fill in for a major character" sounds really interesting to me, as does the unexpected meeting at a party one.
The Freaky Friday trope is such an invitation for shenanigans. :D Just read the one with the enchanted moccasins that switched Nick and Lacroix a while ago. I think it was from Shelly(?). Such a good take on it.
"Here, put on a mask" also inspires quite a plethora of possible plots. I'm really looking forward to seeing which ones you'll choose.

Happy Holidays!