I followed a similar route. It isn't really cost effective to do actual N reg FAA training outside the USA. For a start, the aerial work issues around N reg mean that last time I looked into this one had to do it in france. However, you aren't going to need more than 3 hours of actual USA CFI time (for the check ride recommendation). Nor do your hours need to be in an N reg. What you can do is to study the unfamiliar manouevers with any instructor and fly them in wherever/whatever suits you. Any half decent instructor should be able to teach the ground reference manouevers etc. The part that needs a FAA CFI is really the check ride preparation and the lead up to the check ride itself. Definitely best done as a concentrated three week trip to the USA, when you can also do the written exam etc, as well as learn the format of the check ride. Most importantly, study hard the 'prerequistes for flight test' in part 61 and make sure you have the required hours breakdown which has different requirements to EASA, . For example, you will need night flight, which you may not have. Again, can be done as part of the check ride prep.
Hope that helps....