not sure what you mean by 'quantize'
if i come across that many notes in a full 6/8 bar, i fell 'two big beats' so group them accordingly
ie i may pay 15 + 16 , or 16 + 15, or 14 + 17, or 17+14
if you want to build to it, though this is less preferable because we're trying to make the notes fit a subdivision vs. the larger pulse, so you'll interrupt the flow a bit until you go back and fix it,
you can do it as groups of quintuplets and a final sextuplet
i would attempt
5 + 5 + 5 + 5 + 5 + 6 or some combo there of, really doesn't matter where you stick the sexteuplet most of the time. whatever flows better for you.