Well think about this, ok your knobs would still be there but where would your AC display go? Your A/C is displayed on your radio screen...
There will NEVER be a kit for 03 accords, most you can do is add an aftermarket radio in that box you got below it and lose function of your steering wheel crap and what not, there are many ways to hook it up but all in all, leave the shit alone and get an amp... What do you want? I mean its a 6disk CD, and looks clean. If its not loude enough for you get an amp like I did... :P