...Alternatively, should I open a bank account at ScotiaBank in Dubai, deposit the require amount, and take the bank statement and certificate of balance with me to Canada as POF?
Your this step entitles u to
deposit the amount in a Canadian A/c (from Dubai) - & is not akin to bring in a draft to take it back. Both your steps r unrelated.
If u chose this step, u'd need to w/draw the funds here & carry it back to your homeland/country of residence - in whatever mode u opine/deem fit. It's not like bringing a draft & take it back.
However, as
Explorer advices - both the formats r valid & possible.
Qorax