It looks like Compass is just a command-line tool, which you could certainly access without any Objective-C using TEALoader. Just write scripts to call SASS or Compass in whatever language you’re familiar with (Ruby, PHP, Python, Bash, whatever) and you can link them into your Sugar with some simple XML:
http://onecrayon.com/tea/docs/shell-scripts/
There’s support for running short shell commands via Javascript in Spice, as well, but I haven’t worked out the kinks enough for a beta yet.