It is a lot of work to change a 7mge with automatic to 7mgte with a 5 speed. You would be better off finding the latter and fixing it. It is not a question of if you can do it but of how much you wish to invest into the conversion.
Below is a car for sale, have no interest in selling it
http://cgi.ebay.com/ebaymotors/toyot...item2c60240983