It seems that a very short straight mouthpiece with a round opening would provide the advantages of blowing directly into the melodica but provide a clean “mouth grip”. This would be especially useful with the uppper end Suzukis, as their blow hole opening has space around it where air can escape. I guess a regular straight mouthpiece could be shortened for this purpose. In any case, more attention could be given to mouthpiece design.
Thanks for these tutorial fragments.