The current government posturing about a Pacific pivot is simply talk, with the exception of a trade agreement. As you mentioned the Pacific Ocean is vast and is the Arctic region. If they were serious they would seriously need to augment the RCN and RCAF with the necessary vessels and aircraft to do the job. As much as it pains me to say this, given the limited Defence budget, the Army would need to face cuts. In addition, there would need to rebuild the diplomatic and humanitarian aid capacity to establish strong political ties in the region, more comprehensive trade agreements like the CPTPP, secure logisitcal agreements, staging/base rights, and so forth to protect a very long and vulnerable strategic line of communications.
Nuclear powered submarines, while idela, are simply not an option for Canada primarily due: to their massive cost; large infrastructure requirements and their maintenance; intensive manpower requirements, training and their retention; and need for substantiational physical and cyber security of assets.
The government knows what it has to do, but it can only focus on the short term (perhaps up to four-five years) due to election cycles and ever dynamic political and economic situations which grabs their attention.