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javascript:

// Take the current page URL and put it in a variable called url
var url = document.URL; 

// Create a new variable called tweetbotProfile and replace the mobile twitter url with the Tweetbot x-callback-url scheme
var tweetbotProfile = url.replace(/https:\/\/(mobile.)?twitter.com\//,"tweetbot:///user_profile/");

// Go to the new URL in tweetbotProfile
window.location = tweetbotProfile;

// To get this to work using Twitterrific just change the tweetbot:///user_profile/ to twitterrific:///profile?screen_name=
// Enjoy!