Epson's ABW was designed to be a non-color-managed workflow. In the
beginning Photoshop would have let you select a print icc profile and still
get to ABW in the Epson driver. In general this would be a mistake since
all provided icc's were for the color driver. To prevent people from inadvertently
doing this Epson and Photoshop got together to disable ABW when using
a print profile -- hence the "printer manages color" selection is necessary
if you want to reach ABW. This is actually a conversion to a fixed profile
(sRGB on the Mac).
When I wrote Print-Tool for the Mac I figured on the default case to be just
like Photoshop but I added the extra feature of allowing No-CM or an ICC
print profile and still getting to ABW. But it is special and does need special
icc's (ala Create-ICC). I'm not aware of an easy and straightforward workflow
accomplishing this for Windows but there may be one.
The other possibility is to make a Photoshop .acv Curve layer that you can
add to an image before printing. Not as elegant but works just as well.
Roy