It's not Morse, but the CyKey[1] was a chording keyboard using the MicroWriter chords[2]; advantage that you can feel the keys without looking, and don't have to move your hands. The CyKey had no feedback, no click, silent operation rubbery buttons, IIRC. The CyKey use Infra Red so it would be difficult to use at night, but a similar device - five or six keys wired into an rPi could be very good for this sort of use case.
