updfate 2 lines as follows:
*OpenUI *FXColorMode/Output Color:PickOne
*OrderDependency: 20.0 AnySetup *FXColorMode
*FXColorMode Color/Color: "
1 dict dup /ProcessColorModel /DeviceCMYK put setpagedevice
Update 3 lines as follows:
*FXColorMode Black/Black: "
1 dict dup /ProcessColorModel /DeviceGray put setpagedevice
Some PPD Files the Black and White option may be called MONO, not GRAY as shown in the example
By making this adjustments users won't be able to print in color to the BW printer queue.
(two queue setup required)