Plotting a filled contour and saving as eps or svg

Out of a certain experience i have some doubts, that

exists, but still, you need vector graphics with reasonable support for fonts.
SVG 2 EPS exists in various flavours - based on librsvg or inkscape. GitHub - lobingera/Rsvg.jl: adaptation of the rsvg lib can be used for eps output, within julia. And yes, there might be font issues.