Dan: I'd say go out and buy a few Multitaps, Lik-Sang has them for $15 a piece, you'd get 4 connectors. $3.75 per adapter, and I'm sure you could get something arranged with Lik-Sang for bulk.
http://www.lik-sang.com/info.php?catego ... ts_id=130&
Couldn't you always build your own, isn't it just 10 wires in a straight line?
I'd definitely go for the adapter first, as long as I can still attach it to the adapter/device somehow, so I don't have to put it on a table.
As for the stylus in drivers, couldn't you make the stylus not reset to the center when you let go of the analog stick? My wireless gamepad has a similar feature, there's a gamepad mode, and a steering wheel mode.
holy internets batman.