I agree, unfortunately, that he will probably find someone to make the master carvings.
But, if you are finding original condition, original paint Mason decoys at "fairly cheap"...let me know where. Seems to me that if the Mason factory lathes even thought about touching that piece of cedar, people want a premium for it. I have thought for several years about buying an original, but beat up, Challenge or Premier Mason mallard to make a rig of Masons to gun over. Fill the dents/dings/cracks and the inevitable tail chip(s), and put it on the single-spindle duplicator I have that's just sitting in the shop right now. Just for me, and just to catch the odd looks at the ramp...Mason decoys, Model 12 Winchester (hopefully a Fox or L.C. Smith some day)...
The issue is that a Premier or Challenge bird is going to run several hundred dollars, minimum. As an example, there is one on this website for sale. Top part of the head is gone, tail is almost missing, and the tag is several hundred dollars. That isn't "fairly cheap". Though you have a point, in that if you can spend $500 for a master and send it overseas, have 1,000 copies or more made and sell them for $50 or $100 each, then the cost of the master carving is nothing...
And, that's why the guy wants to do it....same reason why there are people on Ebay who sell duck decoys that are their version of a Mason and imply that it is a Mason decoy, when it clearly isn't.
It would be interesting to know who currently owns the rights to Mason decoys...