It seems like it would work, but I can't see any reason why that would be a problem -- pages *are* allowed to refer to any other public pages, including ones in other Spaces. (Which they could do trivially with an absolute "http://" link anyway.)

The one thing that this *does* raise as a potential problem, though, is that having a dot at the beginning of the name is the signifier of an OID. So I may have to disallow that anyway, to avoid ambiguity...