How are you handling the time lines in your chronological edit? I did a sd edit of this myself years ago, took two tries (pc died 4 seasons in on one try and no back up) and I cut it so Jack dies on the island, watches the plane fly overhead and then the entire alternate time line plays out as his near-death experience with the end being the group reunited (with all the scenes of him dying on the island excised as they were used for his island death scene).
Ouch, that’s a shame.
It’s gonna be mainly the same as the original edit I’m basing it on, same episode names and so on, so the Flash-sideways will be in its own Epilogue set after the events on the Island.