Sounds like Switzerland
-great educational system
-top notch health care︆ system (I have spent 5 days at a hospital in Zurich, can confirm)
-strong business︇ environment, sure
-immigration possible, yeah with money totally possible
-can brush up French if needed︈ - yeah but you dont want to live in the French-speaking part of Switzerland, thats︉ like the socialist part with higher taxes
Or Ireland, there you get English speaking culture,︊ but little bit worse on everything else compared to Switzerland. You can be non-dom though,︋ which is great if you have assets outside Ireland as there would be no tax︌ on these.
Maybe Singapore which is up there in terms of education, health care and︍ business environment, and they speak English even if it's not quite an English culture. Problem︎ with Singapore is that immigration is difficult.
Or finally the UAE, English speaking, super-international, by️ far the easiest immigration of all these countries. Very good health care, good business environment (but not good jobs market), decent education, but maybe one doesnt want one's children to have uni degrees from the UAE, but they can be sent to study elsewhere. Best tax wise of the bunch. Got to handle the heat in the summer though or spend the summers elsewhere.