P-38J-15 would be ez, Yak-3, Yak-9M, Hurricane IIA, Fw 190A-7, there are a bunch that would be fairly ez to put in. Just varients of existing types.
Ju88C-6?
...as for the Yak-9D PLEASE, yes, we need a Yak that has something like a "standard" nose armament ie 20 or 23 mm.