Yaarel
🇮🇱 🇺🇦 He-Mage
The D&D game engine is versatile and has tools to play differently.Which, bases on the original premise of this thread, is all an official D&D S&S setting would do. No low magic, rewritten classes, or radical overhauls. D&D with a taste of the S&S flavor. Anything else requires more rewriting than an official product would dare and probably is needed.
Banning fullcaster classes for low magic and banning high tiers for reallife relatability, making combat encounters more lethal, are nondrastic but effective.
A setting might also offer a new character option (subclass, species, lineage, feats, backgrounds, spells, magic items) or a new monster, to emphasize certain themes mechanically without interfering with the game engine.
D&D can do much to adapt convincingly for diverse genres, in convenient ways without anything drastic.