Using the kitchen stove may not be the best idea from a safety perspective.
Pure metallic lead ingots are safe, but the smoke and dross from casting lead are not. From a lifetime of casting, I can testify how hard it is to maintain a clean casting area and adequate ventilation. Trying to do it in a food preparation area, it is nearly impossible to prevent contamination.

A Lee bottom pour pot is a small investment, less than an iron pot and hotplate, and easier to use.