Please first let me know if you are the government representative/agent here. All you say is about what government benefits from. Please do not answer my posts if you cannot help.
Such a policy that I say is not refundable when you are there. You can cancel it or tranfer the remaining months to the next year, only when you have left Canada.
Government representatives are available at CIC, it is very unlikely that a government representative / agent would conduct an official conversations in this or other fora.
Be aware that this is an open forum, anyone can answer any post, we all have that freedom. Feel free to ignore my replies, that is your choice

So the statement "What you need is a long discussion with an insurer, to configure a policy for your specific situation. " does not help?
It is actually the only way you will get a reply from the people who can issue a policy.
You will find that when refunds are offered on insurance policies, the amount returned will be minimal.
Also note that if a policy is refunded and new cover was needed, then there would usually be a reassessment of the insured parties conditions of health, this may result in increased cost.
A continuous policy (longer term) is normally a far less expensive option.