Why not just make a short adapter cable? Far be it from me to disagree with Jon (who is King of Innovative Uses of Neutrik connectors as far as I'm concerned), but even though the NC3MRX and NC3FX will screw together, then plugging another XLR connector into the NC3FX seems like it creates a real chunky and somewhat heavy and rigid unit all attached, presumably, to the back of your microphone. If you make a short adapter cable, you have the same number of soldered connections and the same number of pin to socket interfaces, but you avoid that long-ish lever that is rigidly attached to your mic. It may or may not be a big deal, depending on the mic and the clip or shockmount.
With a cable there's no diddling around with epoxy and no risk of breaking the wires between the two Neutrik connectors when you screw the two together. Although the Neutrik connectors will screw together, the nylon inserts with the pins/sockets are fixed with respect to the metal shells, so as you screw the two pieces of metal shell together, you'll want to 'pre-counterrotate' the wires connecting the two halves so they don't break due to twisting.