I'm slightly confused by the subject of the thread and the above, can you clarify what you mean: clone/replica/tribute. Also I hope you realise the term replica refers to illegal counterfeits. A "clone" if that is possible would be legal provided it is not branded as a Conn. A tribute would be a different matter, e.g. a Ref54 is a tribute to a MKVI - so it is not a clone, but supposedly nods it hat in that direction.
I can't imagine there being a lot of demand for either so my gut feeling is this would be unlikely although of course it would be very possible to make a very good close copy, but for $800 (retail) - I think that wit wouldn't be possible for any entrepreneur to make something top quality for that kind of price. Top end manufacturing in China is getting more and more expensive. I have been doing some research and although there are still plenty of low quality sweatshop type factories, the high end manufacturers who have a much higher ratio of skilled to semiskilled to unskilled so although you can obviously still get a cheap saxophone made, to get quality the costs are a lot higher. Also these types of factories that can deliver the kind of quality you get in Europe or Japanese saxophone ne manufacturing are quite rare.
Even when you identify one, they are very busy as they are making parts for the "big four" as well as some European boutique manufacturers.
But it is possible, however as mentioned, I think the final price would be way higher, especially given the investment needed in tooling and development.