@unspeaker Hm... I would have preferred something without rasterization, but hey, that could work (:
E.g. this seems to do it:
`magick -density 300 in.svg temp.png && magick composite temp.png -compose src -tile \( temp.png -resize 400% \) out.png`
(making use of the fact that ImageMagick actually calls Inkscape to convert the SVG file)

You can do it without rasteriation:
1. `inkscape your.svg -o your.pdf`
2. open the PDF in PDF Arranger
3. Right click the page
4. Select "Split pages"
5. Enter 4 vertical 4 horizontal splits

Limitation: I don't think it can add margins for printing, maybe the printer driver can do that.

I'm not sure if there is a cli only solution, it could surely be done with some python using #pikepdf, if you need it fully automatic. Memorizing the keyboard shortcuts for 3-5 could be a quick workaround.