I do wish tinyVG or similar would take off, but I don't see that ever actually happening. the only thing I think it's missing is animation support, which is pretty niche but not as niche as <script> tags.
This would allow an update to the xmlns to
<svg xmlns="http://www.w3.org/2000/ssvg">
<img type="ssvg" src="/insecure.svg">