Is the 20 cm Lightning to 30-pin adapter functionally different than the shorter all in one part

The cableJive dockStubz may do the trick. Designed to extend the port in bulky cases, it features a MicroUSB port on the side to charge with older accessories that don't support charging.

MicroUSB should also support an iPad charge, though it may be very slow. See here for someone saying they can charge their iPad with a MicroUSB adapter (admittedly officially supplied by Apple, but the point is the protocol and cable can handle it). Worst case it will say "not charging" and will charge in sleep, and when not charging the drain will at least be significantly slowed. You will probably need to plug the microUSB adapter into a high power USB port – ideally the iPad 10W charger itself.

I can't guarantee this would work but, were I in your situation, I'd give it a shot and let us know. You could always return the adapter if it didn't suit your needs.

Good luck!

The iPod out functionality is actually a very specific feature that was added only very recently. Only a few cars actually support it, so the vast vast majority of appliances should continue to work fine.

Here's the thing, though: "iPod Out" doesn't actually mean "audio output from an iPod." It's the branding for a very specific feature for cars and remote-screen tools that was included in iOS 4, which delivered a customized iOS graphic display via the in-dash screens when the device was docked

http://www.tuaw.com/2012/09/13/lightning-30-pin-adapter-works-with-analog-audio-ipod-out-doe/

For the Video functionality, this will be coming soon - the connector is capable of it, but it most likely requires additional circuitry in the adapter to implement it.

As with the 30-pin connector, the Lightning connector supports video output; Apple told Macworld that Lightning-to-HDMI and Lightning-to-VGA cables will be available “in the coming months.”

http://www.macworld.com/article/1168555/what_apples_new_lightning_connector_means_for_you.html