Seems to be verging on a Frigate sized vessel (I know they don't go by tonnage, but I bet politicians and TBS Bureaucrats likley do) at 3,000DWT, which also limits the shipyards they can be built in and no Polar Class rating.
One option is to contract a foreign shipyard that can build right now a proven existing large corvette/small frigate to produce 3 hulls to fill the gap till the RCD's come online in numbers and allow us to decommission the worst of the Halifax's. No real Canadianzation of the design, just speed into service that counts. Then sell those ships off to a friendly nation when we have enough RCD/CDC in the water.