Digital BW, The Print

Photokit sharpener works only on RGB images. So what is the best way 
to apply it for black and white images?

One could scan in greyscale, then change mode to RGB, apply capture 
sharpening and then do all adjustments and finally output sharpening 
and then, before printing, convert back to greyscale.

Or, one could scan in RGB, capture sharpen, convert to black and 
white through desaturation or channel mixer but keep in RGB until 
all adjustments are made, then output sharpen, convert to greyscale 
and print.

With digital camera capture one could follow the latter procedure 
after converting the raw file in rgb, or one could desaturate 
(presuming Adobe Capture Raw)prior to converting and then capture 
sharpen etc. with, again, the last step before printing being the 
conversion to greyscale.

What workflows do people use? Have I omitted some possibilities?