Is it possible to use 3 whole eggs insread of 2 plus 2 yolks. Yes, you can freeze whites but I always avoid recipes with left over egg parts that end

Hi! That would probably work out fine, but it would slightly alter the cake's texture (I suspect it would turn out drier and fluffier).

Sure. I make a New-England-style corn cake every spring to serve with fresh berries, and have always used whole eggs. You'll likely benefit from the extra egg protein because this cake is so high in fats which have a tenderizing effect.