Use Xianxia genre conventions to reinvent Kara-Tur while also updating the timeline for 5e to incorporate the Spellplague and the Second Sundering. Or hell, get a Xianxia author to consult or even write the setting, and maybe a series of tie-in novels. If it comes out looking like 三生三世十里桃花/Three Lives, Three Worlds, Ten Miles of Peach Blossoms, you're probably on the right track.Considering how WotC is carefully handling culture/racial/gender/etc issues right now, I do not think we will ever see a full-blown book on the region unless and until they feel they can walk the line just right in the writing. And I am fine with that. I do not want to see a book full of negative stereotypes and biases.
A plot idea I have is for Shou Lung to have undergone a dynastic shift some time in the mid-late 1400s DR, with the new dynasty maybe swallowing T'u Lung or Koryo. The last scion of the previous dynasty, who survived and fled to Faerun, would be a major NPC and quest giver for a hypothetical party.