I tried both of those approaches. Switching to a MIDI style has an additional problem: some of the newer (RealTracks) styles are better than older (all-MIDI) styles. But I tried it; I get, at most, a drum track. I also tried the hold-down-Shift method in DAW mode, dragging into Logic; the track drags as audio no matter what.

I'm ready to believe I'm doing something wrong & simple, but I can't see what it would be. I've certainly made MIDI files in the past.