This does exist in an IBM Selectric typewriter. The keys aren't linear, they are logarithmic, but it's pretty close.
Instead of a speaker, I would add a solenoid into the case, so whenever you hit a keypress, you hear and
feel it. The hard part would be to keep in under the 500mA USB spec.
Linear/clicky is almost impossible to do, as the energy needed to make an audible "click" sound needs to be harvested from the key travel, then after the click sound, it has to continue at the same linear rate. This is almost impossible to do in practice (I know of no keyboards that do it, though my ancient model F is closest) without getting the energy for the "click" from somewhere else.
Does a blue and white stem differ, the part that isn't the click slider. If so try swapping them all around just for fun.
I published a lengthy photo-guide between Greens and whites. The biggest difference is the "black" click part, though they look the same, and have the same springs, whites are much quieter sounding than blues (even with a blue spring). I am considering these "White Lights" as the keyswitch of choice for one of my upcoming DIY keyboards.