This program converts between various scripts, while preserving accents, text in other scripts etc.. So, one can, for example, tranform publicly available proofread dEvanAgarI RRigvEda text, and use this online interface to this program to get the vEda in unicode ಕನ್ನಡ ಲಿಪಿ with proper accents. If you have proper fonts, you should be able to view it properly.
You are welcome to use the service as it is, to contribute and build on it. If you want us to support your script, provide us with a map exactly in the format illustrated here for ಕನ್ನಡ!
Note that V, which does the same job, supports many more scripts.
It has a couple of unmapped characters: The chandrabindu. The kannaDa chandrabindu is set to enter the unicode standard, and will be supported by future fonts. If you have other suggestions, please let us know.