I ordered a Lotus mesh pad, and as
@StringTheorista mentioned, it can fit but would take some slight reforming to reduce the size enough to fit in a nano gong or stem. I was about to start that process when I remembered I had a few Healthy Rips Fury 2 mesh pads. When comparing the two different pads I found the Fury pads to be a bit smaller. In fact, the Fury mesh conc pads are so close that it only took some slight manipulation with my fingers to get the pad to fit in a nano gong without needing to change the shape. It's a tight fit, but they slip right in. Success!
You do need to push the pad to the top of the gong so you can smear some wax or rosin on it, and then a wooden skewer or dab tool to push the pad down to get the best distance from the heater. I did this once with some rosin and it worked pretty well. I still need to find the best distance between the pad and heater and it does require sliding the pad up and down in the gong in order to load and adjust, but once set I am hopeful that you get a nice session without the need to mess with the organic cotton. And the Fury 2 conc pads are five for $10 with free shipping.
I will update again after more research.
Stoners love to tinker.