Extract B&W data from Bayer sensor RAW?
even if this would be working you still woudl have the problem, that the b/w values from the different pixel woudl contain different information. Just imagine an uniformly green leaven or a red roof, or... an what the values of the neighboring pixels would be in such a region of the image. If you woudl have detailed information on the spectral properties of the bayer filter you could "guesstimate" the values back by taking the info from neighboring pixels with different colors in account... but then again you woudl loose the additional spatial information...
To get higher apparatus resolution removing the AA filter will still have a bigger effect... but with more artifacts.