If you did cut up your scraps it would be easy enough to put in by hand since the PL would not be light enough to float away like down.
I tried this on a small scale since I have a source for lots of climashield scraps
I think CL would be similar to primaloft used like this. The CL tends to clump together and not distribute very well. For a small pillow it would work but on a UQ you would have to stuff a lot (heavy) in to avoid cold spots from the clumping.