Get a full-sized keyboard - a model M would work fine here - and a laptop with a broken screen plus some assorted bits and pieces. Fit the motherboard from the

Get a full-sized keyboard - a model M would work fine here - and a laptop with a broken screen plus some assorted bits and pieces. Fit the motherboard from the laptop in the keyboard after making the required openings in the keyboard enclosure. Hook up the power supply and a monitor and voilà, a keyboard PC.