i reckon it would fit, but since you have such a wide tyre on such a narrow rim, it is more likely to try and rip itself off.
Soooo, unless you get a new rim a 2.35 would ride just fine, it wouldnt squrim, it'd be lighter :shifty:" and just overall be better. i can see no advantages of using a 2.5 tyre on a really narrow rim.
Just my opinion