Why did you choose a pan flute? I thought so when I listened to it. Bert Kaempfert used traversal flutes for this tune. The flutes from SRX 06 or the SRX 03 are good, I used them in my Integra version, (and one of these boards can be used in the G70). You are right that vibrato isn't necessary, it is in fact the mellow pan flute sound that doesn't fit.
You are wrong about the choir: I originally made this sequencer file on the MoX (not MoXF), which has poor choirs, and thus I integrated the choir sequence in the flute and strings tracks. And now I was too lazy to create an additional track for the choir. The SD1000 and Integra both have very good choirs.
BTW, my versions were also intended to mimic this same original recording, with the typical trumpet style of Manfred Moch (not yet Ack van Royen) and the specially edited Knackbass of Ladi Geissler.