I guess so, but it would be easier to just use a dot or more natural just to use the Ru (in devanagari script).

As a Tamilian, I feel obligated to be offended by your suggestion. How about http://www.fileformat.info/info/unicode/char/bf9/index.htm instead ? :)

The problem is that your suggestion would be interpreted as Hindi-favoritism, when India actually has many languages and scripts.

You're not "Tamilian", you're Tamil.

Both "Tamilian" and "Tamil" are valid nouns for a Tamil person, but "Tamil" is more often used as an adjective or to refer to the Tamil language.