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There is no way to copy-n-paste keyframes from multiple layers without using a script.
You can show the keyframes in a layer by hitting the u key. And then you can copy those keys layer by layer.
I'm not sure why you're opposed to using a script. I wrote one that can copy and paste keys from multiple layers in a single click (including copy-pasting with ...
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There is some substantial work that would go in an effect like that.
You'd have to first track the face of the slowed-down singer in 3D-space and apply a mesh to it, which sticks perfectly to his features.
Then, you'd want to rotoscope the normal-speed singer's face (which is going to take a lot of time alone) to then apply that pass with your tracked ...
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