I promise that you REALLY, REALLY, REALLY do NOT want to do this!!!
First, it has not been announced officially which Fiat cars will be sold in North America other than the 500.
Second, the costs of doing so would be horrible.
Third, a US version Bravo will have a lot of differences to a European version. Parts will be different between them as US safety and emmissions laws are different. Trim levels and options will also be different. At least a UK Bravo will have the speedo in miles rather then in Km but that's your only positive in a huge sea of negatives.
Fourth, why would you want an RHD car in the USA? Other than the U. S. Postal Service and their contracted-out rural deliverers, no one else drives them. And RHD-specific parts will never be stocked.