Like you said, the company that makes the spoons has no web presence. Why not become a dealer and set up a website? See if you can sell a few and maybe buy a jig to rent out. It wouldn't be a big labor investment that way. If folks are interested in rebuilt wheels, then get into doing it.
For what is worth, I do farm organic. Dad bought Ho-bits as they were called when he got started 15 yrs ago and used a jig from the company to put them on. I don't remember if he had to pay extra, but he had to send it back. They worked good, but they didn't take the rocks. Now we bite the bullet and buy $40 wheels for half the hoe and put them over the rows. When the spoons wear out we'll move them off the row and put an other set of new ones on.
For some one without rocks (or some one who hasn't tried them) those ho-bits are a good deal.