Hi,
I am very interested in your ideas, I wrote something related, Reset-coin:
https://bitcointalk.org/index.php?topic=427306.0the approach is different, but the aim in the same, how to guarantee a mínimum wealth to every human being and equal starting conditions to everybody. And even how to correct too big differences between rich and poor in the future. The idea of a reset function, could look too radical, but it is just an starting point of discussion.
Like you said, the key point is some kind of "proof-of-human-work", I have some ideas about that i hope to write on a next Update on Reset-coin post.
Hope to know you feed-back.