One of the reasons they changed the port was so that they could make devices smaller, so a hybrid port is a non-starter.
Or a small adaptor that plugs in flush with the bottom of the phone that converts the 30-pin to the new format. This is Apple, they are supposed to be innovative.
A plug that fits flush with the bottom of the phone? Do you mean a flat connector?
But of course that would not have brought them in $19 to $29 a pop to let you kludge your old accessories to work with it, so I guess I see why they did it this way.
And your solution is....?