OP - no need to worry, CRA is very reasonable and they don't care much about these types of cases assuming that you've truly become a non-resident of Canada and don't earn income in Canada.
File a T1 adjustment for the last year that you lived in Canada and filed taxes. Anyone can help you do this, but you need to sign the forms - you can even probably do it online (I think that I did it online, but it's been a few years).
CRA isn't scary and they're very understanding about these sorts of things.
Ladies & Gentlemen, filling out NR73 is a "trap"! Please browse the CRA website to see what status you fall into. A "filled declaration" does not give you a safe pass at all. As long as CRV finds a little clue that you have "residential ties" with Canada, you will be considered a "factual resident". Someone mentioned OSAP, if it is being repaid by your own bank account, there is no way to call yourself a "non resident".
Has anyone come across a Hong Kong based accountant or tax specialist who actually specializes in this matter?
As I would like to get my Non Resident status all up to par, and yes I have read majority of information on it. And I do have some capital gains/equities to claim.
Any leads for accountants or tax specialist people have used would be greatly appreciated.