There are actually very few people involved with GA in the agencies, and everybody that phones them up will get through to the same people, and will of course get the same atory. They are hardly going to encourage somebody to go N.
Getting the required training, and the required logbook entries in the UK isn't a problem. It is the checkride that might be, because the worst case scenario is that you have to get an examiner to visit. This is easy to arrange but is very expensive unless you can share the costs with others.
If somebody REALLY cannot go to the USA for even the checkride then I would agree that this could become a trap. It could more likely become a trap if one did one's training while relying on a training firm to arrange an examiner; they might not be able to.
There is also no doubt that doing all thetraining in the USA, just like everybody has been doing for years, is going to be far cheaper and quicker than doing iot here even if you have your own plane.
But there is no likely clampdown on N in the next few years. Far too many fish to fry and most of them are far bigger than GA.