We're not seeing much success in changing the minds of goofy devotees of Andrea Dworkin & Catherine MacKinnon on M-Fem, to be sure. And we are unlikely to easily change the minds of radical economists whose primary interest is not feminism.
One thing that occurs to me, though, is that when Ricardo posted obnoxious remarks on gay men & feminism on PEN-L, a lot of posters rose up and criticized the remarks variously. The same happens on M-Fem, which becomes active whenever obnoxious posts of MacDworkin varieties get posted. So, if we have the Devil's Advocates, so to speak, we can & do discuss how we may integrate class & gender analyses. The problem is that we only reply to the most idiotic negations of class & gender respectively, so our e-list discussion seldom rises above affirmations of basic principles ("both class & gender matter") & goes on to conduct more sophisticated analyses.
As for Marxian value theory, there is a good reason that it may _appear_ to be a "double" of the mainstream variety. Political economy under capitalism functions -- both in theory _& practice_ -- as if nothing outside of M-C-M' mattered. Marx's capital is mindful of this "as if" modality which has real effects (which some Marxists may have forgotten). When political economy -- in theory _& practice_ -- treats nature & reproduction (of labor power & social relations) as if they were externalities, this exclusion has real effects, which are contradictory to both capital & labor. What Jim O'Connor calls secondary contradictions affects primary contradiction, and vice versa. Lise Vogel, for instance, writes about this dialectical relation with a focus on reproduction. The trick is to analyze the dialectic of primary & secondary contradictions without forgetting that political economy -- not just in theory but _in practice_ -- functions "as if" nothing outside of M-C-M' mattered (if we forget the latter insight on the compulsory "as if" modality, then we go down the slippery slope of Post-Marxism). Take a look at criticisms of Alain Lipietz by various writers in a recent issue of _Capitalism Nature Socialism_
Yoshie