Does aluminum foil work instead of parchment paper

Tin foil will catch your microwave on fire.

You can use rags instead. However, paper towels are not going to leave fibers behind that could later block your gun when it is in use, causing you to strip...

Yes, that should work the same as toilet paper.

Wax paper is made with wax and can melt or even ignite in the oven. Parchment paper is made from paper and is oven safe.

You can, it just won't be as flexible when you fold it. I'd recommend not adding stems, as that will put more weight on your flowers.

You can try cling film or tin foil. It doesn't work as well as wax/parchment paper though.

I wouldn't. Aluminum conducts heat too well. That's why you use something like a thick, quilted cloth or even felted knitted potholder made from wool that will shrink.