[BBury]

...the game already has Essex class CV's...

These are not exactly the same as the ones used in Korea, they were extensively modernized right after the war (WW2 that is), got angled decks and all that jazz to make them capable to operate planes such as the Panther. Before this it was very impractical if not outright impossible to operate high performance jets off carrier decks.

CV-9 (Essex), although it had a new modified flight deck and tower during Korea didn't get an angled flight deck until 1955. It probably won't take much to modify the in game Essex to reflect the Korean era Essex.

BB