As promised, Cycleboyz were able to silver-solder a small barbed "stump" into the fitting that bolts to the engine.  While I was there to pick it up, I also bought a nice hose clamp finisher, some 3/8 Gates oil hose, and 3 litres of Motul petroleum based oil. 

Oil fitting picured in previous post is in the spares kit -- will see if this setup is oil-tight.