Utterly disclaiming cleverness, but… Create a new MIDI track (e.g., “Drums”), and use the “Routing Grid” on its inputs to point to all your individually-programmed drum lines. Arm the new track for “Recording”, hit the global “Record” button, and then “Play”.
Finally, deactivate the separately-programmed tracks, route the MIDI output from the new “Drums” track to the same instrument, and PROFIT!