I may suggest two easy ways how it may be solved technically: * Introduction of a special namespace on a "larger" Wikipedia. * Introduction of s subdomain (e.g. simple.de.wikipedia.org) with shared admins (that should be simple with SUL). I believe there is no need for seperate set of admins for such project. Also note that such projects have tendency to become POV forks and community of both main and simple version have to control NPOV issues on the smaller project.
--vvv