Elizabeth, Hi.
NLK is permitted on the fares, as it is a Territory of Australia in a broad sense - you just need to watch your AKL transfers at each end and make sure they fit the fare rules.
It's hard to tell what the taxes will be as it will depend on your routing, carriers and stopover points. Budget for CAD600.00 to be on the safe side.
Circle Asia Fares from HKG would be a published level for the CCASTAR1 of HKD33410 (or CAD4854.00). Hardly worth it when compared to the Circle Pac from YVR or SFO/LAX - even with your YYZ to start/end point add-on fares!
As per all airfares, the country of origin determines the currency used, so the Circle Pac fares quoted earlier would be CAD if you start the trip in YVR and USD if you start in LAX/SFO.
Cheers.