I don't know if this is too late or not, or if you are committed to a lemon cake, but The Ultimate Oreo Cake from the Brown Eyed Baker would be a real good entry because it showcases a number of techniques. It calls for a cream cheese filling that could be replaced with one of your other white frostings that doesn't need refrigeration.
https://www.browneyedbaker.com/cooki...eam-oreo-cake/