After some thinking I decided I could use my spacetime simulator as the net, and coins in place of the leaves. I set things up on a weekend in my classroom and dropped a free weight in the center. This is the result with an iPhone 7 in 240 fps video mode:
I wanted to test Paul Robinson's idea about air resistance. In place of coins, I placed packing pillows on the spacetime simulator and repeated. I was not surprised by the result:
Obtaining a trapeze net was a non-starter for obvious reasons. I did some image searches of nets for ideas and decided on a cargo net. These come in a range of prices so I selected the largest, cheapest one I could find, the 100" x 140" by Grizzly Gear. It was only $12.95 from Amazon. The openings in this net were large so leaves wouldn't work. I decided to use colored 8.5" x 11" sheets of paper. Although I am sure I would have several volunteers, I decided to drop an inanimate object into the net instead of a student. My 20 lb medicine ball has many uses, this would be another good one. If you don't have one, a large bag of water or a large water balloon would be a good, inexpensive choice. It would add some other interesting elements to the slo-mo video! If you have other ideas for this demonstration, please leave them in the comments.
I needed students to support the net much like firemen holding a blanket for someone jumping from a burning building. Students also would need to place the paper on the net and drop the medicine ball, leaving me free to video it. I would need to pick a tall, trustworthy student to drop the ball accurately from the second floor from the roughly 4 meter height. If this idea gives you pause, it should work pretty well from about 2 meters like the Coins on Spandex demonstration. On the last day of class before finals, I had enough time to try this out. Here is our first attempt: