There are no "procedures, requirements and obligations that I must apply to Canadian government as an away resident".
1) A PRTD request based on H&C grounds is, given your narrative, most likely to be denied.
2) A PRTD denial will automatically revoke your PR status, subject to appeal.
3) That is an option.
4) Until you formally lose PR status, you will be allowed to enter Canada, assuming that you can prove your identity. However, you are quite likely to be reported for failure to meet the residency obligation requirements. This will trigger the process of revoking your PR status, again subject to appeal.
5) Until you lose your PR status, you have the same employment rights as any other PR. Your SIN will be dormant and need to be reactivated by Service Canada.
6) Two years of provable physical residency will reset the non-compliance of the RO and then you will be able to renew your PR card. Don't know about BC health insurance etc.
7) This really isn't relevant. Failure to disclose, when asked, for truthful information regarding your absence from Canada, is likely to lead you down a path that you don't wish to go. Misrepresentation.
8) It's still valid until it's formally revoked, renounced, you become a Canadian citizen or you die.
9) Yes you can report those lost but it will achieve nothing. SIN cards are no longer being issued. Your BC Medicare card is expired and you will have to apply for coverage