Is it an Acapella or original mixdown?
If it's an Acapella, try pushing it through a pitch bending VST with Automation points to specifically activate the pitch bend at the bad note and cut it off after. Or if you got a mixing board, tie the automation to a knob and do it by hand to get a better result.
If it's original mix and in a vocal breakdown section where you would normally do a highpass/reverb dropout/breakdown, you could just mask it by using automation to force the whole track to pitch bend on a 1 bar crescendo. Or, you could do some crazy automation bending a la Dub/Glitch to cover that space, like a stutter effect on the vocals, which would draw attention away from a single note or passage.
Enough of that...great remix so far. Make sure to hit me up when/if you post more trance, you've got a uniquely simple style that I like to listen to in vocal trance, even if I don't actually do alot of the simple vocal trance remixing myself.
Peace