Seriously. The global ultra rich are all working from the same basic playbook. It’s just happening here first due to the extreme concentration of wealth.

Strategically, the best option other nations have to solve the American Problem is to prepare to weather the storm and let the country collapse by itself.

Historically what's going on now with the US is a pretty straightforward "fall of the Empire" scenario (the biggest Empires invariably fall from internal problems as the generations that created the Empire are replaced by generations which know nothing more than wealth extraction) and interfering with that is a great way to be targetted as a scapegoat by the falling empire's elites and suffer the side-effects of that empire's death throes.

Looking from the outside, even if Trump is stopped, the problem will at best be delayed since the other party of the Power Duopoly that controls America is also deeply corrupt and done their part in the decay of that country for the last couple of decades (by weakening unions, deregulating Finance, unconditionally saving big companies, having Financial and Economic policies which reward Rentierism above Work, and so on) - Trump is not the malaise that's killing America, he's a symptom of that malaise and removing him will not solve the problem, will not stop another one like him to take over in the future and will not alter the trendof decay, only the speed of it.

As for the idea that Fascism is taking over in other countries, well, the rest is well behind the US in it and it's exactly the point of the OP that people in other countries are already starting to push against it, well before it gets to the level seen in the US of jackboots (for the US that would be ICE) going around arbitrarilly arresting and even killing people.

We are thinking about that. In fact, as per OPs post, many are acting on it.