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Can’t you apply for a Canadian passport from abroad once you have the citizenship certificate?
There would be no problem entering your country of original citizenship with your other passport.
 
Hello
I will have my ceremony next week, but right 1 week after I need to travel for an important personal event, Once I become Canadian I will be dual citizenship from a visa exempt country, reading the the following link, I assume I could apply for a special authorization , I guess all should be ok ? any experiences to share?
Dual Canadian citizens need a valid Canadian passport - Canada.ca


Thanks

If you have time, you can apply for Canadian passport (they may issue you a temporary). You can also appy for the special authorization, yes.

Or you could simply travel to a US airport and cross the land border, who will accept your other docs proving you're a Canadian (e.g. show that you did the oath etc). [To be clear, they will look you up on the computer]