I am serious too. The thing about PanF, is that it is even slightly grainier than Delta 100 under most circumstances. So a Delta 50, or especially a Delta 25, would be way less grainy than PanF.
To me Delta 25 would be different enough than PanF (and different than anything else too) to coexist. Then again what do I know about the film business. This is just one of the things on my wish list (and I'd still prefer Delta 50).
Delta 25 contrast would be difficult, but it could still be a very interesting film, and also a much better option for people currently trying to use all those crap document films with poor POTA variants. It would also be the only 25 out there with Ilford quality.