Cast stitching

You could try that combination first and see if it works for you. From memory, Crimson Hides produces irons that are closer to 'stitching chisels', which gives more of a square-like diamond shape hole. These are easier to stitch for most, though you will likely not get the traditional looking high angles from a true 'pricking iron'.

For an improved look, irons from Wuta, Kevin Lee or similar will probably work better for what you are looking for.