if i could make a suggestion...what about the way rugs work? You know how if you place a rug on a sloped piece of ground, it'll flatten itself to the ground, not stay level? Is there any way to apply this to a neighborhood object and accomplish your goal that way? The rug goes under the snow texture on a lot, so if you could figure out how to apply the rug's basic characteristics to a hood object, it should go under the snow there too, assuming that snow works the same way in nhood as on a lot.

This probably wouldn't work, but it just sorta appeared to me.

if rugs can appear in the neighbourhood, this can be a try.
If not, my add the lod90 scenegraphic counterpart into a recolour like how plants are made to appear in the neighbourhood.