I think Harmony+ sounds the best too, while leaving room for Harmony++ in the future (even if Harmony++ is what a C nerd might say today if he obtained another Harmony).
Of the music ones, Harmony Forte seems the least bad because a successor or special edition could be Harmony Fortissimo. (I don't like Allegro because after packaging o2em for a few different Linux distros over the years, I think it's a terrible, unmaintainable library.) "Reprise" is usually a brief restatement of an earlier theme, if I remember correctly, and this Harmony is an expansion of the original, not a brief restatement.
Weren't there some 64K compilations in addition to the Boulder Dash demo? Regardless, I'm more curious about what kind of RPGs people will attempt with 512K of RAM -- and then add in the SD card multi-loading that to my knowledge no one has used on the original Harmony for some potentially massive games.