D&D: Is this plot twist too much?

The party I'm DMing for is currently in a parallel universe from which they started. They also travelled back in time several months in the universe change. One of the PC's (Frank), listed, in his backstory, that he was a former king of a nation. This country was ruined by a mysterious, dimension-hopping individual (Lucian), and Frank's character is now seeking revenge. However, I stipulated that Frank's character had lost most of his memories, and no longer remembered much about (a) how his country was ruined, or (b) anything about Lucian, beyond the fact that he had an artifact that let him travel between dimensions (and presumably, universes).

Now, my plot twist, which I was going to slowly reveal, was that Lucian is actually a future version of Frank's character attempting to set up a stable time loop. Everything Lucian has done was actually for the greater good. By ruining the kingdom, Lucian prevented an eldritch abomination from being released, and set Frank's character on his quest. If Frank's character cooperates with Lucian, Frank's character will eventually finish the stable time loop. However, Lucian needs to regain the dimension-hopping artifact (something the rest of the party opposes) to finish his part of the loop. Frank would have to sabotage the party from within, while appearing to be helping the party.

Is this too complex, or would it work, if I took most of the reveals slowly?

Also, I have other major plot elements centered around the rest of the party. It's not just Frank.