Wow, that looks fantastic!
Hmm... having the text animate to different scales and then pop back to normal might be tricky... just tried to do it with a single wave to no avail (I thought there might be a way to trick the animate-from-time-drawn waves), so the best choice might unfortunately be... duplicate the wave in the editor a few times, and modify the scale control to be different on each? Then do "<w=sneeze1>a<w=sneeze2>a<w=sneeze3>A" etc... I thought of potentially adding a modifier to the tag like <w=wave,1> but there are so many potential values to change with that, it doesn't feel right?