@3den Agreed, that would make this a lot simpler for all parties. However, this might prove hard with Bootstrap (and probably with other packages as well), since the actual build files are not in version control. One could argue with the possibility to have Meteor compile the CSS automatically with the LESS package, though. Seems like a big job.
EDIT: Never mind this! It looks like I was watching in the wrong places when looking for the build files. They're in version control as well. A submodule would work perfectly!