WP-CONFIG.php – WordPress

So, Is there a way force my WP-CONFIG.php file, change it’s values, automatically.
For example this peace of code:

/** MySQL database username */
define(‘DB_USER’, ‘username‘);

/** MySQL database password */
define(‘DB_PASSWORD’, ‘password‘);

I want the ‘username’ and ‘password’ value, to be changed (with given values) every X minutes.
For example, after 30minutes, the username will become: username1,
and the password will become: password1

This is due to my MYSQL user queries per hours.
I have 75,000queries per hour, by a single user, but by changing the users every X minutes, I will manage to increace that limit..