The nearest you can get is probably a keyboard designed to simulate the touch of a tracker-action pipe organ, which has a "snap" at the top of the key movement which is similar to the "pluck" of a harpsichord.
The touch of a harpsichord is completely different from a piano or most MIDI keyboards. On a properly regulated harpsichord, the notes will sound fully when the keys are only pressed 1/4 of the way to the keybed, which makes playing baroque ornaments a completely different experience from a piano, and much easier than on a piano, once you have mastered the technique.
On a piano keyboard you can get away with "partially hitting" adjacent keys to the one you want to play, buit pianists trying a harpsichord for the first time often wonder what on earth is going on, because the "hair trigger" nature of the action means they are playing several unwanted "wrong notes" for every "right" one.
SE doesn't approve of shopping recommendations, but the only two suppliers I know are Fatar (based in Italy) and Midiworks (in Canada). They aren't cheap, and they are supplied as "bare keyboards," not as a finished instrument that you can play. You may be able to find a local organ-builder who can assemble the keyboard(s) into a working instrument - but expect to pay a few thousand dollars for it. There are companies which build these keyboards into digital pipe organs - i.e. their product is basically a "traditional" pipe organ console with a MIDI interface, intended to drive a synthesizer.
One potential problem is that a pipe organ keyboard may have a higher key weight than a harpsichord. On a real tracker-action organ, the key resistance depends on how many ranks of pipes are being played, i.e. on how many air-valves you are pulling open against the wind supply pressure, to let the air into the pipes. Actually the same is true on a large harpsichord with several "choirs" of strings, any combination of which can be plucked. But the playing weight can probably be regulated - at a price, of course!