@_munter_ @eleven_ty @Netlify I'm sure you could bend @eleven_ty to your will. It's super flexible like that.

And @eleven_ty can do this directly. But I like to do it upfront once per build for the sake of speed.

My thinking for this bit of gulp in this, my personal boilerplate:
https://www.hawksworx.com/blog/keeping-sass-simple-and-speedy-on-eleventy/