How to use Logic X Default Instruments in a Drone

You can export the midi track directly from the drone, and next, replace the drone for the instrument that you want.

Keep in mind the a drone is a SOUND element not a MIDI element. When using a drone the midi data come from Synfire.

Perhaps, you can create a Summing Stack (not sure about the translation of this concept, my manual is in Spanish) adding your Logic instrument, export the midi from the drone and mute then the drone.

You can use a MIDI Drone for that, or more precisely: A regular Drone put in 'MIDI Drone' mode. Then you add your sound plug-in behind that MIDI Drone in the DAW, so it will receive the MIDI Drone' s MIDI output. 

I haven't yet checked if this works with Logic Pro X. Apple never really supported MIDI routing betwen plug-ins. They have added MIDI Effects lately, although a MIDI Drone is not a MIDI Effect.

Let me know if you get this to work and I'll add it to the Wiki.

check the sound tab in synfire, you should see the drone/device listed there and a check box to indicate its a midi drone.