I have no objection if you want to resume ITF, but the problem is that there is too few people. As you noted, the Hagfather confrontation only has Joric and Annie left. The only plausible solution would likely be godmodding, autokilling, or a deus ex machina, all three of which would seem rather awkward and forced.
But a fresh new start, following only one new plotline instead of three, with a standalone story, would be much better suited to the current state of the forum.
Beneath the gold, the Bitter Steel.