Good advice for probably every field except law.
Law is so different in most European countries that it won't be of much use in the US. Also a lot in civil law hinges on subtleties in the respective language.
Possibly; I've met two Israeli lawyers and two British lawyers who moved to the US and were able to pass the bar exam within a year or so - I have no idea how hard they worked at it (and what preparations they did before moving to the US), but it was certainly cheaper then going to school in the US.
If you are a lawyer in one country and want to practice in another then take the exams in the country you want to practice for sure. Going to law school in another country to save money is a completely different thing.
Also: UK and US both have Common Law traditions whereas most of Europe does not. Israel is a more involved case.
I'm confident that most people on HN can pass the bar exam without law school. Law school really wasn't much of an advantage for the bar exam, just do the prep course and study hard full time for six weeks and you would be fine. Unfortunately I don't think any states still allow sitting the bar exam and being admitted without a law degree.