A simple .nod assemblage to create a Kiepert Trefoil.
This uses the simple trigonometry equations in the paper.
The curve can be self trimmed, and the 3 curves revolved to solids.

https://www.researchgate.net/publication/363627988_The_Geometry_of_the_Kiepert_Trefoil


Also, there is a thesis and paper on using trefoil as spline:

http://rave.ohiolink.edu/etdc/view?acc_num=case1596460534956624

https://cad-journal.net/files/vol_19/CAD_19(6)_2022_1255-1269.pdf

- Brian