I'll look forward to hearing your compositions!

I'm still wrapping my head around the maths involved in music, but what I'm finding is that the 12-tone system seems to be a necessary compromise that allows for key changes, and for singers and instruments to play together. It's starting to feel a bit like Godel's incompleteness theorem! But you're right, voice and strings allow us to approach "pure harmony" in a way that keyboards and fretted instruments never do.