Looks interesting, but an ebow was my go to for that kind of sustain back before I built a guitar with a Fernandes Sustainer in it.
….and now I want to put a sustainer in one of the acoustics….it’d be like combining the new bow with an ebow and a shred box, kind of like the Moog VO-96 acoustic synthesizer, which I got to try some years ago: https://m.youtube.com/watch?v=crn-m6J7qcc