Thank you both very much for your answers! They’ve been hugely helpful. I had the idea to write a story set in an isolated city somewhere in the Cosmere where a Dragon relocated a small population of Singers before the False Desolation and rules as a type of god-king, using their own investiture to change the Singer’s forms thus consolidating power. Whether the Dragon did this out of benevolence/malevolence, and what exactly the dragon gets from the arrangement are two of the mysteries I have planned for said story.
I don’t think what I had in mind would work exactly, but I can probably make it make sense with a few tweaks. Regardless, thank you both again!