Because to make an affordable 35mm telecine, you'd pretty much have to build it from scratch. 16mm and 8mm telecine units can be made using the transports from older home movie projectors, of which you can find tons out there for practically nothing, and that were well-engineered. That's what Roger Evans at Moviestuff did to make the workprinters - he makes them out of old Eiki and GAF home movie projectors. They still have significant amounts of new engineering in them (different motor, completely different optics, etc.), but the film path and housing is largely original.
By contrast, there has never been any such thing as a home movie 35mm projector. The only projectors are the professional kind used in movie theaters. They are much more expensive and there are much fewer of them. They are not easy to find used, they take up a lot of space, they are complicated, require maintenance, and they are heavy. Shipping is expensive. Plus there is virtually no market for an affordable 35mm telecine unit, because there is no such thing as 35mm home movies. You can't even buy 35mm movies, for the most part. So no company is going to make such a thing other than for high end Hollywood-type applications. You CAN buy a 35mm telecine, but expect to pay a good $30,000 or more, installed and working.
So, you'd basically have to go out and buy a 35mm projector, and you'd have to engineer the telecine unit yourself. It could be done, but probably not for under $10,000 and many months of effort even if you had significant mechanical and electrical engineering experience. I think the best chance of seeing something like this happen, would be if someone on this forum were a mechanical engineering student and did this for a college degree capstone project... possibly in a team of students. But then still, someone would have to front the money to buy a used 35mm projector to base it off of. If one turned up for cheap at a theater closing, that might be possible. 35mm projectors of various types and condition pop up on eBay fairly often. You'd have to know what you were getting.
The Workprinters are marvels of clever, quality engineering out of cheap off-the-shelf parts. I've become convinced that Roger Evans is basically a genius who has single-handedly changed the way small-format film is handled.
Or, you could pay a service to transfer it for you... except that nobody is going to touch a print of SW - or any major commercial movie - with a 10-foot pole due to the risk of getting shut down legally.