the R Class doesnt really have that Great an AA defence, They were barely refitted inter and During the war
What we need for good AA is a WW2 Refit QE, Like the Queen Elizabeth with the 20x 4.5 inch armament also seen on the Renown all with Proxy, and also more normal AA guns but eh
Russia did not modify the royal sovereign at all when Britain lent it to them, same as the murmansk, they were both returned in poor condition but with the same armament as when they were originally loaned
Also, even if a (minor) config change occurred, the devs have and will continue to be able to change weapon arraignments rather quickly, so 2 less 20mms or something of the sort wouldn’t be a massive change.
Why would it need a new model for exactly the same ship, with the same weapons, i dont see what there would require any further development, theyve obviously researched it otherwise russia wouldn’t have it
To be fair it would be a classic gaijin maneuver to not research it in the slightest, give the russian one a magical buff over the standard, and then add a nerfed version to the british tree in an event 6 months later.