Good eyes! I noticed this too in Sciography.One thing I've noticed is that Zoé's handlink is actually a previously rejected design for Al's handlink, by Bellisario. I noticed this from screenshots of the "Sciography" documentary segment on the handlink where the concept art for all the rejected versions was shown.
Zoé's handlink appears to consist of only two colors of acrylic (orange/magenta and clear) with no LEDs or electronics whatsoever and minimal black decals for the "buttons." I would love to own a version of this. I would imagine it would be easier to produce than the Gummi and Calculator versions.
As for the post production sound effects for the episodes, they were few and far between. Almost not worth it to figure out a way to add any, IMO.
So I'm piddling with the idea of doing Zoey's handlink and even sounds, although it would be tricky as you can imagine. I've got most of the sounds captured. The tricky part will be getting capacitive touch to work on the fluorescent orange surface without huge visible wires.