Many (more than 6) years ago there was a pcmcia card (3com perhaps?) that had an ethernet jack that popped out of the card, rather than requiring a dongle. Thi

Many (more than 6) years ago there was a pcmcia card (3com perhaps?) that had an ethernet jack that popped out of the card, rather than requiring a dongle. Think of it like a cross section of the important parts of a normal ethernet port, with push-to-latch, push-to-unlatch-and-deploy behavior. Rather than requiring movable parts, it could be built into the keyboard with some sort of protective cover on both top and bottom (if there's enough clearance on the bottom for the end of the ethernet connector). It's possible. It might be too costly to get acceptable reliability, but it's possible and it's been done.