With some machine work, parts from Pegasus will work. You need a -6 tube nut and -6 male-male connector. From a plumbing supply a 5/16" compression ferrule. Make a tube sleeve to fit the nut and 5/16" pipe with the end chamfered for the ferrule and chamfer one end of the -6 connector. The left parts in the picture:
Slide the nut on the pipe, then sleeve and ferrule, tighten the connector and nut. The ferrule seals the connection.
Now get a -6 Socketless elbow of the angle you need and -6 hose. The -6 Socketless hose is 0.30" I.D. so it will fit on the engine pipe without further pieces. But if you want to plumb the whole bike with AN you can use one of these:
It clamps onto the engine pipes with AN-6 ends.