If you are going for US licenses and you are going to live in the USA, doing anything much in Europe is going to be a lot harder work in comparison.
You can do the flight training here but checkrides are hard to organise and examiner availability is uncertain.
But if you want to do all possible stuff in the 2 years then go for it ASAP. You will need 1500hrs (incl 100 night) for the ATP and you can do that in G-reg C150
You don't want to turn up in the USA in 2 years' time and needing to hour build the 1500hrs - it will take you ages and pure hour building is utterly boring.