I still have the wish to build a board for a Raspberry Pi or similar that, through the GPIO pins would be able to drive an Apple II as its console (using the keyboard and 80-column display) by directly reading from and writing to the 6502's address space. A tiny bit of firmware could initialize it as a normal Apple II peripheral and, with the right software running on the Pi, it'd be possible to emulate a number of different cards in software.

If I could lay my hands on an Apple ///, which had a color-capable text mode, it'd be even more usable.

My real wish, however, is to be able to actually work from the Apple II :-)