I really don't have an established workflow as I do for color images. I look forward to learning from others.
I typically use Silver EFX PRO 2 for all post-production of film scans with little or no rendering work in in LR. When the SEFX TIFF returns to LR, I will crop and straighten if needed.
With Raw fileS from cameras, I just use LR for the first stage of monochrome post-production work. There are several ways to make true monochrome images (zero chance of a color cast when views or printed on RGB devices). My cameras have support for four different monochrome LR Camera Profiles as well.
For work I select for Series or submit to exhibitions, I usually start over with a rendered image that with minimal manipulations in LR - cropped and straightened, sharpening, global or selective noise filtering. Then I use SEFX for everything else. For some images I may decide to adjust tonality in LR using the color temperature and luminance parameters. I can do this quicker in LR than SEFX. I prefer to dodge and burn with SEFX by far. I also use Viveza 2 for occasional dodging and burning with color images. I'm sure a highly skilled PS user could create essentially identical tools, but dodging and burning with SEFX and Viveza is quick and effective.
