Here are a couple of attempts to make the shackles. The first I tried to steam bed wood laminate. I made a 2 piece form and steamed to pieces in a steam box and then tried to bend them in the form. It was too much work and the quality was marginal.
This was the method I ended up with to laminate 3 layers about 1/4" thick together with the center layer the grain crosswise of the grain in the 2 outside layers.
See the broken one, these are solid Ash, that I did before I started laminating them.