Plugin: can I anticipate midi events automatically?

Hi, I made a soundfont that solfeges the notes on a score, that works pretty well, but...
Many note names (e.g. Si, or Fa) have a sibilant part that should be played a bit ahead of the beat, to sync the vowel perfectly with the beat, especially at faster tempos...
The problem is less evident with short attack named (e.g. Do)
I think that it can be done manually into the piano roll editor, but I wnder if it could be done automatically with a plugin that shifts back all the needed notenames by a certain amount of milliseconds (or ticks, or whatewer...)