I may be hopelessly naive about this, but my general experience would seem to suggest that there's not really a need for this, because folks who are attracted to Wikimedia projects tend to share our (deep down) core values. If not, our various communities tend to push them in that direction fairly strongly.
Attempting to impose en.wikipedia's worldview on things like this is probably doomed to failure, in my opinion... it's almost the online version of pushing a colonialist agenda.
Totally agree that this is not necessary - much paperwork, discussion, !voting, etc and very very little actual benefit.
Most projects are quite mature and settled their own rules, standards, etc. Coming in as a "big boss from foundation" and telling to change things around will only cause resentment.
I think the only global principle that's true to all projects is FREEDOM. Both in $ and (c) sense. So give the projects another freedom: decide its own policies.
Renata3