I have run sound for Stephen Bennett and Andy Walburg many times at The Harp Guitar Gathering. Neither of those guys uses a dual pickup system. Muriel Anderson has a dual source system and requests a mic for her super treble strings. Those are the premier players in the harp guitar world and that's what they use for live sound.
For recording I know Stephen Bennett does not use internal pickups, only a mic. Take all that FWIW.
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