kymikz

Great post!

I had myself this itch to scratch and ended up making an overly over-engineered tool to do just that: https://cartosvg.com/

I think it might interest you as it covers all your use cases (except the responsiveness part maybe), and personally I thin it can lead to quite beautiful results :)

Cheers!

Indeed, good catch! The boundaries are taken from the CGAZ release of geoboundaries (https://www.geoboundaries.org/downloadCGAZ.html) project, so it may be resolved in a future release