It looks like the enterprising folks at Acid Mods are about as impatient for the official Wii Zapper attachment as we are. The only difference between us is skill. An admin named cyberpyrot repositioned the Wii remote's IR sensor to the front of a classic NES Zapper gun (gray-colored; none of that neon orange here, folks), and re-mapped the Wiimote's B-button to the Zapper's trigger.
The result? A much slicker way to play the three mediocre FPSs currently available on the system. OH SNAP!! Some video of the construction process and mod in action after the jump.