Must confess, I was expecting this problem when I do the inner CV on mine. Not done it yet....but would expect the splines are slightly rusted together. I'd start off by trying a bearing puller to press the shaft out of the hub. I don't know how the hub bearing is constructed though, so this could possibly end badly depending on the type of bearing used, needing a new wheel bearing assembly to fix it.
Keen to hear how it goes......
....or if anyone can say what type of bearing it is. If the centre race is solid, it should be fine, if it's a 'slit inner' then there's a good chance it'll come to bits......