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I don't think there is software yet that does that. The kernel module is roughly the same as on the K3, though. Internals have changed.
On the other hand, I can think of an approach following the "nightmode" implementation on Kobos. It overrides libc functions in userspace, namely mmap (for the framebuffer memory) and ioctl (to intercept the refresh calls). Porting that to Kindles and adapting it to fiddle with the refresh data would be a way.
Arguably, no need to be a programmer to tackle this.
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