Create a separate feature / plug-in that just contains the parser

I have a project for which I'd like to include Groovy support. Not the whole workbench, but just a copy of the language parser. I would like to have a split like that become part of the org. codehaus.groovy pair? e.g. org.codehaus.groovy (a) and org.codehaus.groovy.core (b) where a depends on b?

As a way of an example, I can use JDT as a plug-in without the workbench