Several (5 to 10) years ago REI sold a combination 32mm headset, and Bottom Bracket lockring wrench. Most importantly, it was small and made of aluminum, therefore very lightweight and perfect for touring.
They don't sell it anymore. Does anyone remember who made it, or where one can be bought today?
Failing that, are there any other possibilities for lightweight wrenches that fit the less commonly accessed fittings on a bike? (( I am aware of the Park 15/32mm touring combo that's made from steel.))