I plan to make this Orange Salted Honey Cake that calls for a salted honey pastry cream filling. My time constraints require me to make the cake on one day and serve it the next day. So, of course, it needs to be registered. It always takes about 8 hours for my cakes to come completely to room temperature when I remove them from the refrigerator. May I assume that is too long for the pastry cream filling to stay out? If so, is there a way that I could make a "faux" salted honey pastry cream that is not perishable? Or, is there another salted honey filling i could use that would work well? I would really love some advice on this. Thanks.