Health – “So this is enough of a reason to be – ?? ????? ????? ???? ????? ???? ?”? – I don’t think so! So there must be another reason(s). How about this one -“that zionism could be classified in our times as avodah zara”?!?”
One of the three exceptions the Rambam lists for allowing people to leave E”Y is to learn Torah. I’m not a posek but it seems like you could make a kal v’chomer that if it’s muttar to leave to learn then it should be muttar to leave in order to teach.
I think you are mixing up loving and living in E”Y with zionism l’havdil. Just because someone chooses to live in Israel instead of moving to Chu”l does by no means classify them as a zionist. The Eida haCharedis operates out of Yerushalayim and is probably the biggest private kashrus hashgacha in the country… are you suggesting they are zionist?