I think the RCN would do well to not use the term amphibious in conjunction with this, and it does not have to be "for the army."
What I would envision is a mother ship for the AOPS. I've talked before about the need to centralize air, sort of the way we used to do it with the AORs, but plused up. It becomes centralized everything for our Arctic, remembering that it is an archipelego.
Canadian Navy Eyes Ice-Capable Amphibious Landing Ships for Arctic Defence shows a ship I think would be about right. 4 spots, an air group of say 8-10, 2nd line aviation maintenance, a
small well deck, C2 capabilities for sea basing (again, not amphibious), and the ability to resupply the AOPS on one side.
The purpose would not be to bring the Army to the beach, but to have any easy base for whatever you wanted to do ashore. Think what we tried to do in Somalia (successfully until it wasn't) with the AOR and Sea Kings. A nice cozy hoping off point.
Also note that rendering has smaller helicopters than Cyclones. You'll need more helos, so use the opportunity not to buy more Cyclones (notwithstanding the other conversations) but somewhere around 20-30 lighter aircraft (that will fit in AOPS). This thing could have a couple of Cyclones, or Chinooks, but the majority would be the smaller aircraft.
I think the other thing the Navy needs to focus on is using it to solve the manning issue, not make it worse. Make them cheap to put to sea and small crew. When not doing their sea basing roles all those extra C2 and shore support areas make excellent classrooms. Plus, all those extra berths. Use them to get people to sea to train, load em up with baby NWOs and whatever, plus training aircrew, every monday morning, and sail them until Fri as a schoolhouse and experience builder.
But don't call them amphibious. Because before you know it we're right back to trying to emulate the marine corps, which we will never be able to do.