I am not convinced the battleships production was halted because they wanted to build more frigates and destroyers, but more because they realized almost right away that battleships were not the top dog anymore and rather just big targets with no benefits. They did continue and increased the production of aircraft carriers, for instance.
BTW, the corvettes developed the tactics for convoy escort function (raspberry and half-raspberry), but none related to the work of hunter-killer groups. Those came mostly from the brilliant mind of Capt Johnny Walker, a RN long serving regular.