Your wish aligns with a wishlist item I created. Not exactly the same, but pretty close. I think a mixed implementation of our ideas would be great.
https://forums.flightsimulator.com/t/suggestion-for-performance-optimization-make-terrain-lod-only-affect-terrain-and-ground-textures-with-separate-lod-sliders-for-other-things/509780
and here’s another related wishlist item: