I see your dilemma, you want your Qatar employer to treat your home country as Canada so they will provide you holiday airfare to Canada and not India. Inform your employer to treat your home country as Canada so they will provide you holiday air travel to Canada, even if you will be mobilised from India. Just have all written down, you do not what will happen in the future. Some new person in the might come in and ask why they're providing you holiday tickets for Canada when they hired you from someplace else.

It all comes down to the paperwork.