It's a nice idea, and it's been tried before, but we need the tools to do it first, have a look here:-
http://www.mympxplayer.org/rockchip-...676.html#52676
and here:-
http://www.mympxplayer.org/anyone-wh...s-vt10186.html
The tools do exist, but getting hold of them isn't easy, they are licensed to authorised firmware developers that are trained by Rockchip Electronics Corp..
Yes, you got everything 99% right above, but sorry to say it's not going to happen without the Rockchip SDK..