Why do you not, then, hear of Christians having Bat/Bat Mitzvahs or Purim. Are Christians putting blood on their doors? Why not give your best of what you’ve produced to church and give it to the priest? Why so selective with how you want to relive Judaism. Do any Jews reenact Melchiezedek’s service? They knew that a different priesthood was created by God then and we got a different one from God. Christianity is what God intended Judaism to be. We can watch a play about Moses, but we don’t participate in the rites they had then–esp. if it’s a Jewish service conducted by Jews.
Besides, as I said, they added stuff not revealed by God. Jews from all over went to the temple. They can’t even offer temple sacrifices, because the matter they had for their rite was burnt-up. They made stuff up. Don’t encourage them in their blindness.
If you do any seder, do it like how the Gospel had Jesus doing it, but even then, I don’t know if that was all that was said and done at the Last Supper. It could be like a The Nativity re-enactment. The kind the Jews had elsewhere that night–forget it. Instead, invite a Jew to the kind Jesus had, as much as the Gospels have it, plus the only 3 cups of the they drank. If any part of the Jewish kind is involved, I think it would have to reflect the change to the consecration part. I’m not a theologian, though, but the priest and his fellow priests on that site does know his/their stuff and is/are not schismatic.