I don’t know how you use REX (Real Environment Extreme) in your system. I just choose the environment textures I prefer and then install them into FSX or P3D for good. True, I might pick a different cloud or sky texture once or twice a month to give the simulator a fresh look. But that’s all.
Based on the concept from my earlier ShadeShifter, which allows the changes of tones and colors of the environment in the simulator everyday, I recently wrote another utility that could inject different pre-extracted sky and ocean textures from REX according to the calendar day of the month, prior to the loading of FSX or P3D. And these textures have been further mixed to maximize allowable texture-combo variations. In other words, my sky and ocean now look differently each day.