I haven’t seen it recently, but if you contort your hand, it is possible, as Grandjany must have done it. I always found playing harmonics and regular notes in the same hand to hurt, so I just don’t play those pieces. Only, I used to use this a lot for restaurant gigs. If the regular note is below, you stick out your fourth finger to kind of hook it. It doesn’t lend itself to good harmonics, though. If you can play the harmonics and reach your second finger out over the 3 and 4, try it that way.