I wrote a script that converts a bezier shape to a parametric shape. It only takes 1 step instead of 32. Oh, and it can do all your shapes at once.
Rectangle - click to turn the selected shape layer from a bezier rectangle to a parametric rectangle.
Circle - Click to turn the selected shape layer from a bezier ellipse to a parametric ellipse. ALT + click to turn a bezier ellipse into a parametric rounded rectangle.
I mentioned a few things in the video that you might find interesting.
Explode Shape Layers by Zack Lovatt (aescripts.com/explode-shape-layers/)
Measurements by Paul Conigliaro (conigs.com/ae-preset-measurements/)
Rigged Box by Paul Slemmer (paulslemmer.com/rigged-box)
Artwork by Louis Wesolowsky (louiswes.com/)
Download Parametric Converter on my site. (kyle-martinez.com/tools/parametric-converter)