You can get Bromptons with 7speed hub as standard. Im not sure about a Rohloff 14 speed, but that is probably too expensive.
There are specialist folder sites, like AtoB, which will direct you to specialist Brompton sites.
Brompton is the best folder for carrying on transit, and short hops to the station, but it is not a touring bike. You can ride them on longer rides, but if this is your intention, you are better off with a different design.