I modded one row of a keypad using clears with brown springs about a year ago, the goal being to make something with a tad more tactility than a brown switch, but I found the results undesirable; I didn't experience any "stuck" switches, though it's seemingly possible.
My conclusion was that clear keystems have a roughness to them that is comfortably mitigated by the stronger stock springs; it slows and eases the keystem travel into the sharp point of tactility. However, when the brown springs were combined with the clear keystems, that initial guiding resistance was missing, and your finger slams right into a grainy, abrupt point of tactility that slows the keystroke unpleasantly. The whole point of a lightweight spring is lost on the clear keystem in my opinion.
