When I look at the Portuguese NRP D. João II class UVX, I note it is is 107.6 meters in length. It is a small but quite possibly very capable for its size UVX. Then I took a look at the Harry deWolf class, which is 103.6 meters. They are both around 7,000 tons displacement.
Presumeably for any Canadian UVX, it would be very beneficial to be Arctic waters capable (to the same extent as the Harry deWolf class). Granted - that is a bit of a requirement stretch by me .... Still .... if I may follow up on that ... I think in naval architecture, the "golden rule" is that it is almost always more expensive to engineer ice-strengthening from a warm-water hull (converting NRP D. João II ) to make arctic capable, than it is to engineer complex topsides (such as seen on NRP D. João II class) onto an existing ice-hardened hull (Harry de-Wolf) .
ie. If the RCN wanted to go for a UVX that has limited arctic water capability, modification (perhaps with 5 to 10 meter of hull stretch) of a Harry deWolf design, replacing the upper deck to look similar to a D. João II class UVX could be a less expensive way to go.
At first blush I think that may look strange, but I believe its expensive to modify an existing hull design to be arctic capable.
Still, these ships at 7,000 tons are small.
Ideally, so to provide better protection against inclimate arctic weather it is beneficial to be able to maintain and store UAVs in a lower deck which likely means an elevator. But if only one elevator, then that risks a single point of failure. Putting two elevators in a 7,000 to 10,000 ton UVX may not be feasible in terms of too much space consumed by elevator machinery in the hanger deck (ie the deck below the flight deck). Possibly a work around would be one elevator (aft), with midships an 'emegency crane hatch' where a crane could lift up the UAV if the elevator had a failue. The Harry de-Wolf class has a large crane although if a redesign to a UVX was to be considered the crane would possibly require minor relocation to be consistent with the entire upper deck redesign to be closer to a NRP D. João II class UVX.
Obviously massive speculatioin by me.