no idea about the applet, but the effect itself is rather easy to achieve (though in example below it might not be as pretty due to generic gui window used).
this script uses zenity for selection window, and xsel to manipulate selection buffer and xdotool to produce fake ctrl+v
Code:
#!/bin/bash
dict="αβγδεζηθικλμνξοπρςστυφχψω∙⇌⇋Δ°"
# select char
char=$( zenity --list --column=Character --height=700 < <( echo $dict | sed 's/./&\n/g' ) )
# put char in ctrl+c/ctrl+v buffer
printf "$char" | xsel -bi
# paste char automatically by emulating ctrl+v combination
xdotool key ctrl+v
i gave this script a hotkey in keyboard prefs and in works. Invoke the script with hotkey, doubleclick on any char, it appears in text (and still lives in ctrl+v buffer)
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