So I personally know there is very large amount of players that are sad they didn't grab EA Alternative Avatar while hero was on EA.
So my suggestion would be.
Why not re-enable older EA Alternative Avatars for separate purchase after hero is added to normal hero pool.
So basically while hero is on EA you get him and his Alternative Avatar (and icon) for price of 350 gold coins. But once he is gone from EA you can still purchase his alternative avatar but you naturally have to buy it separately (and maybe for bigger price).
That would be a smart move of re-using older models/skins and still make money from it...while keeping your players pleased.