O-rings, available from motor factors in a wide range of sizes, do very well for holding instruments and controls on the handlebars and would hold the brake too if sized right.
The idea in this thread I like best is Dan's for a tab integrated into the dropout, adapted to a bolt-on like the Pletscher/ESG stand. Such a tab can also be machined into the Rohloff-designed OEM slider dropouts, making them a one-stop shop of mounts (axle, anti-turn nub, disc brakes, fender struts, rack mounts, stand mount -- a very busy piece of aluminium), keeping the frame clean.
The Pletscher stand, widely considered the best hub-end stand available, has one small problem, already mentioned in this thread: It doesn't matter what you do, every five years or so the bolts loosen themselves, so make sure your annual touch on the essential bolts on your bike takes in the stand bolts, easy to overlook since the standard bolts supplied are black and countersunk into the black attachment tab at the top of the stand.