Some 20 years ago I did spill some coffee onto the keyboard of HP41CV. needles to say it stopped working there and then.
My idea is to replace the dead motherboard with HP 41CL.
I would say that only motherboard and CPU are dead. My guess is that keyboard consists only of wires and buttons so there is nothing to short circuit or damage there.
But question is would a keyboard circuitry survive a coffee spill?