A blend of this mountainous Ether Research Facility mentioned in Ambrose and the CICADA training facility in Mongolia mentioned in Carpathian Mountain would be great.
Would make sense too, since it was where 47 was headed towards before waking up.
There is obviously a medical side to it.
And the team that were in the woods in Dartmoor are based in it (they are the armoured guards on the train). Presumably they brought Grey back to it too.
As for the Ether Facility, it’s from the start about DNA storage and research. Lots of dialogue in the trilogy about medical research toward life expanding research…
Finally, the Hitman Franchise always likes to blend this kind of research with a fabled scientifically perfected soldier.
Hence Elite CICADA+Exclusive Ether 
As for why.
I will just post this fan-art of Lucas Grey post main story by Ellen Chain…
I mean, the parallel to the Splitter story beats and in-game assets are here.
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