This book looks interesting - The Image of Bar Kokhba in Traditional Jewish Literature: False Messiah and National Hero - https://books.google.com/books?id=-pQzV ... ce&f=false
Nothing about sacrifices.
My buddies at Chabad give this - Laws Concerning Kings and the Messiah http://www.chabad.org/library/moshiach/ ... essiah.htm
One really has to wonder how much of the Rabbi Akiba stories are bullshit. Take the Ten_Martyrs for example:Do not think that the Messianic King will have to perform signs and wonders and bring about novel things in the world, or resurrect the dead, and other such things. It is not so.18 This is seen from the fact that Rabbi Akiva was a great sage, of the sages of the Mishnah, and he was an armor-bearer of King Bar Koziba19 and said of him that he is the Messianic King: [R. Akiva] and all the wise men of his generation considered him to be the Messianic King until [Bar Koziba] was killed because of sins, and when he was killed they realized that he was not;20 but the sages had not asked him for any sign or wonder.
Rabbi Akiba is one of the martyrs so one might think there is some relationship of the story to the Bar_Kokhba_revolt.This poem is best known as part of the Yom Kippur mussaf recital in the Ashkenazi ritual. This was made part of these services because of the impact losing so many pillars of Judaism would have to the masses. As such, it has become one of the 'highlights' of the day, marking a point when the congregation should reflect on their own lives and the sacrifices that were made for their sake.
Guess that means that there is a small possibility that 80% of the story is true - at least as far as the victim list goes. The Jewish Encyclopedia doesn't mention Bar Kokhba in their article on this -According to a Rabbinic midrash, in addition to Bar Kokhba himself, the Romans executed eight leading members of the Sanhedrin (The list of Ten Martyrs include two earlier Rabbis): R. Akiva; R. Hanania ben Teradion; the interpreter of the Sanhedrin, R. Huspith; R. Eliezer ben Shamua; R. Hanina ben Hakinai; R. Jeshbab the Scribe; R. Yehuda ben Dama; and R. Yehuda ben Baba. The Rabbinic account describes agonizing tortures: R. Akiva was flayed with iron combs, R. Ishmael had the skin of his head pulled off slowly, and R. Hanania was burned at a stake, with wet wool held by a Torah scroll wrapped around his body to prolong his death.
http://www.jewishencyclopedia.com/artic ... rs-the-ten
There are many fascinating aspects to Bar Kokhba, seems like the third temple is not one of them.