You could try looking at a currency exchange business.
It could be a longshot because of the currency type, but I go to one every now and again to exchange Pound Sterling.
I would recommend getting them exchanged at a bank for CAD (rather than the airport kiosks), but the banks will exchange any legal tender currency.
Businesses will not accept them directly, you will need to pay Canadian businesses in Canadian dollars.
And yes, as the other commenter mentioned, make sure to declare large quantities at customs. There will be a place on your entry form for large currency amounts.
Banks don’t care about “rare” cash. If you’re using conversion kiosks at the airport it’s even less.
https://www.td.com/ca/en/personal-banking/solutions/exchange/currency-converter
You need to report large sums of cash with customs
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