Mysql to postgres

I have a legacy system that has been developed with a mysql backend. I'm in the process of converting it over to postgres. As postgres is case sensitive it appears as I will have to make numerous code changes from "like" to "ilike" and from e.g. "cola = cola" to  "lower(cola) = lower(cola)" and also changing all the indexes to lowercase as well. This is not as simple as it appears as the sql is dynamically generated in the code base, so I can see this as a very lengthy transition.

I have considered perhaps it might be easier to take a step back from the code and look at changing postgres.

There may be a way to change the database in postgres to be case insensitive. i.e. change some of the operations such as "text=text" to be case insensitive. Does this sound Insane? I have looking further into this and have found the  function that does the text matching:

CREATE OR REPLACE FUNCTION texteq(text, text)
  RETURNS bool AS
'texteq'
  LANGUAGE 'internal' IMMUTABLE STRICT;
GRANT EXECUTE ON FUNCTION texteq(text, text) TO public;
COMMENT ON FUNCTION texteq(text, text) IS 'equal';

a. I was wondering if it was at all possible to change the case of the two text inputs to lower case. This will correct all text=text matches.

b. Then, substitute the like with ilike function, so they are the same.
C. By doing this I should not have to change any code at all, I guess I will still have to update the indexes to lower case, however that is a quick task.

Is this at all possible? And I dicing with danger here? Please enlighten me?

Theo