Back to the point of the original post, the most effective way I can see to simplify and streamline the darkroom process (at least in terms of diluting your developer) with a Rodinal derivative is to premeasure the Rodinal(-derived) developer concentrate. You'll want a bunch of tiny vials for your 10ml and 2.9 ml concentrate doses, and I can't vouch for the longevity of a Rodinal clone once decanted from the original bottle over the original crystals (of sulfite?).
When it's time to process, fill your mixing beaker to the appropriate line (290 ml or 500 ml) and pour in the contents of the appropriate size concentrate vial. Stir, and ready to process. As I noted previously, this is plenty precise unless you're fanatical about your sensitometry and print only graded paper (and can get only #3).
For most of the rest of us, it's sufficient to have a 10ml syringe graduated in 0.1 ml -- pour concentrate into a small beaker, draw up the necessary amount, pour the rest back into the original bottle, squirt the measured liquid into the mixing beaker, rinse the syringe with the beaker contents, close up the concentrate bottle, stir, and ready to process. A pair of marks on your mixing beaker will suffice to eliminate a large graduated cylinder. With some brands of Rodinal clone, you can draw directly from the concentrate bottle with the correct size syringe, and eliminate a second graduate. And now you don't need to mess with a scale.