LOL! That is NOT possible. The computer models are good for small signal response, but it doesn't equate to real world power levels. You can try different drivers, but I guarantee you won't be pleased for the time and money spent versus the small gains, again, if any.
I get what you're trying to do, but you're better off just dealing with what you have and saving the money you would spend on new drivers. You can compound this over time and get a proper enclosure and drivers and the seat lift if you prefer. It will cost you less to do it all at once.