YYA, I am with your history up to & including discrimination of Sephardim. After that, the question is how prevalent each of these things were.
How many sephardim wanted to join charedi schools and were prevented by the government v. how many did not want to or were prevented by schools teaching in Yiddish and general attitude towards sephardim even among charedim. (not to pile on here, but I heard from a charedi black ger who was asked directly what problems he encountered in Israel – mentioned that their kids had a hard time in Israeli charedi schools, and he quipped “we converted because of Judaism, not necessarily the Jews”. This was somewhere in 1990-2000s.)
How many parents were fooled that their children were sent to a yeshiva and sent to kibbutz instead?
Again, I am aware of these stories, but I do not know whether this explains major population trends. For what I know, most Sephardim are reasonably “traditional” – either observant in large part or non-observant in some way, but still respectful of chachamim and religion in general, not like Ashkenazi leftists. So, even if someone tried, this was not very successful. At the same time, many are pro-Israel, pro-Army – and I hope that charedi kahal develops a coalition that includes these Yehudim (and their opinions and sentiments) into a grand Jewish coalition.