If you are referring to JOYSTICK analog, the product itself supports it, I bought the first one and it has analog for the joysticks, if you aren't getting the analog for them then that's the emulator/program's fault, not the hardware.
What's confusing me is that you seem to referring to getting hardware that supports partial ZL and ZR button presses like a GCN controller does (being able to lighten a shield in SSBM). In that case, the Wii classic controller doesn't even posses that feature, it's buttons don't have partial press sensitivity, and therefore there are no adapters that can give it that ability either.