Setting the colour of elements in Style → General → Edit style

The system solution of the request concerning the colour of parts (see the attachment) recently posted on Czech forum and discussed here in General discussion seems to be in the possibility of changing the colour through notation (score/notes, staff, barlines, clefs, time signature, arpeggio, beams, slurs/ties, hairpins, volta, ottava, pedal, trill, chord symbols, fretboard diagrams, figured bass, articulations, ornaments, accidentals, tuplets) in menu Style → General → Edit style by adding the colour picker/chooser setting.

Current solution (celecting the measures, setting the colour of notes, and then making the same for each element, e. g. clefs, barlines etc.) seems very lengthy to the user who defines his need this way: "Exemple: I have carols for 3 recorders and each of the flutes I would like to have in different colour (for children to orient better in it).