Being a small wiki, with few contributors and little articles, wiki licensing could be switched to a dual license like GFDL-Cc-by-sa. Cc-by-sa is very similar to the GFDL terms, but license text is not required. You would need to contact with all contributors to get their agreement to publish their previous work under cc-by-sa too. Changing the licensing informationg would make the future ones. And a strong community consensus required :)
Be aware that contributions previous to the switching will be GFDL-only so you couldn't publich it under the second one. This may not apply to trivial information (e.g. like those ips usually give). Unrelicensable texts could either: -Be deleted (the strict way) -Tag them with a template saying 'some parts of this may not be available under CC ' (the easier way)
Platonides