Originally Posted by tsl

Indeed, Pitlock does make them for Nexus/Alfine in addition to Rohloff. See page six of their 2011 price list.

They're not listed on Peter White's Pitlock page (although I'm certain he'd special-order them), but they are available at Urban Bike Tech. Even says "for Shimano Nexus and Alfine hubs".

Note that due to their larger size, they can't be keyed-alike to other Pitlocks.