Good news, people. We've added Kannada in-built typing tool for Kannada Wikipedia as well now. Thanks to Junaid's work - we've used his script to achieve this. Thanks to Harisha M G for helping modify the mapping for Kannada.
The transliteration is working great - I just added it and tested it quite extensively and it is working fine. Please write to the Kannada Wikipedia mailing list if you have any feedback or face any issues while using this.
Cheers,