This idea is not very practical. How can you trust the bounty manager with your KYC documents? How can you be sure that he will not steal your ID information and use it elsewhere? IMO, having a Sr.Member level bitcointalk account is enough proof that you are serious about crypto.
I totally agree with you. When I read that post, the things that you mentioned here came to my mind. When KYC is required then we have to send our identity document and utility bill of bank statement. With these details any one can use them for their works. Therefore I think not better.