Hi Peter, If you leave out the 8 in the \tuplet 3/2 specification there is no issue. Would that be acceptable to you?
Andrew %==== \language "english" { \omit TupletBracket \omit TupletNumber \clef "treble" \tuplet 3/2 { \repeat percent 4 {c'16 16 16 } } } { \omit TupletBracket \omit TupletNumber \clef "treble" \tuplet 3/2 { c'16 s16*11 } } %====