Thanks for the advice, Melodica/Mylodica experts! I wonder if a real P37D would fit in there? I’d probably be pretty happy with just a real P37D!
This blower tool is made out of one of those plastic watering tubes used by florists. I filed open a hole in it and used some excellent self-sticking vinyl-ish plumbing tape to make it possible to get a good enough air seal. It peels off with abuse, but it’s easy to reapply. In this hastily shot picture, the hose connector is pointing the wrong way…obviously, it needs clearance to actually work. I scrape a little, then push this over the reed and blow (staring at the electronic tuner).