Let us smell nearby Twitch.
So, twitch is a massive snowballer at the moment. Give me a pair a kills, an item and a half and watch the avalanche. I love it, but even I can see it's not fair. It doesn't give a fighting chance.
But I honestly think they had the right idea with Rengar (er, one right idea.). What if you had a couple of stink-lines over your champ to warn you Twitch was nearby. Alternatively, what if you could hear him cackling before you ever see him.
Or leave him as is. I'm fine with my quad kills.

