i managed to load cr3 images in the past using the steps in this post: vkdt dev diary, pt2 - #34 by hanatos
that assumes you compiled yourself from source, however: you need to use the rawspeed branch that supports cr3, the patch to db.h mentioned in teh post is already upstream by now and not needed any more.
cytrinox, the author of that branch, is also working on another piece of code that we could maybe use in the future to import raw images, we’ll see.
let me know if you’re trying this and need more assistance.