snorg wrote:

Did anyone make such a thing? It would need to be no more than maybe 6" in length (I realize that may not be possible).

Yes, ATI did I believe.

ASUS did this thing for their MediaBus slots (PCI+ISA combo)

Orchid had something similar. Though it didn't really feature a full soundcard. It just did "voice notes"

The ATI VGA Stereo/FX is the only combo card I know and owned at some point... you also needed it's special cable to actually get the joystick/sound outputs .
Here is a bunch of photos for your viewing pleasure:

and here are photos of the card's setup program:

and this is where you can get the card's audio output if you don't have the breakout cable:

That is more or less what I would need, but it is too long for my case.
Can't imagine it is easy to find, either.

Two others worth mentioning are Cardinal Technologies' "SOUNDvision," and Media Vision's "Thunder & Lightning," though neither meets the length requirement.