To me, the question would be why one would buy anything like that.
A basic requirement for a rep is that it at least has to look plausible at a normal distance. There is no way that the amazing quality of a PP can be replicated for a handful of $$.
There are many cheap reps of expensive versions of PP. All look redicoulous, and make the wearer look even more rediculous. A bit like putting a Bentley badge on a Chrysler.
Don't have poor craftmanship of intricate designs, don't have non functioning complications. It invites calling out (What is that for??? .... Ehhhh, probably just broke ....).
With PP reps, less is more. So stick to entry level PPs. With these there are some pretty convincing reps.
It would be nice if a builder would at least try. I can only dream a rep gets made because Like you all said only 3 available and at 2.5 Mill nobody will have one to copy. Parts for the different complications, great craftsmen for the carvings, and a very well trained eye and genius for actually pulling the team together to pull this one off without a gen in hand would be amazing to find. Now the question is What TD that has relationship with good builders who will seek out the parts, and team to make this project come to life.
There is a lot going on with this Grandmaster Chime. The noise it makes and alarms and chimes it like heaven. To replicate all that wow. I think it took them 7-8 years to build this watch .