KK,
You can take a stock -47F pretty quickly. However, you would have to assure yourself that the US Army certification meets your own national, legal, requirements. You would also have to accept the aircraft ‘as is’ - in terms of mission equipment and workload, the current F lags behind the UK’s aircraft. If you make too many changes it is no longer recognised and covered by the US Army, and will therefore no longer be an FMS aircraft and you lose the pricing advantage of adding aircraft to a US Army block purchase. Write your requirements, agree your KURs then trade lesser requirements until you hit affordability. Start with the money first and you can very easily buy a dog that nobody wants.....