Hi! Thanks for the comment :)
Moving bones will be a bit of a case by case basis I imagine, I use a BoneAttachment3D node that I attach to the neck bone, then I can enable/disable "Override Pose" and lerp the angle as required in code.
I am aware that you can pack the pck file but Godot's own documentation suggests not doing so:
"On Windows, PCK embedding is also known to cause false positives in antivirus programs. Therefore, it's recommended to avoid using it unless you're distributing your project via Steam as it bypasses code signing and antivirus checks."