Honestly for something this niche I wonder if AWS would make a new region, like gov-cloud or secret. The goal would be to use tech that can accommodate ULL deployments.
This seems to the most likely, and it's not unheard of, they have 'local regions' like osaka in Japan.
Alternatively they could just stick a bunch of Outpost racks in the NYSE/NASDAQ data center and create an 'eXn.8xlarge' instance type and charge 100$ an hour.
