Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
And from the looks of things, even the thought of converting Rime of the Frostmaiden to Athas would be laughable.
I agree with most of your points, but this one I'm not sure I agree:
Darksun, to me, is the environmental-apocalypse setting: having the Tableland faced with an unexpected upcoming (dry)Ice Age brought to you by an elemental lord (Cryonax, maybe?) would be awesome. The inhabitants of the setting can mostly make-do with the sun and desert and whatnot, but all they know and are prepared for would be for nothing against the creeping cold!