The underlying concept sounds of interest to me (though obviously I'd need to see how it appeared ingame), but with no intent to insult I don't like many of the ancillary ideas--I prefer the Sith students in the robes used from JC's Back in Black and I especially don't like the idea of the cameos, both of the more commonplace NPCs but especially of Kreia. One of those (Lorso, given that she was after all Czerka) would be fine, but all of them together stretches coincidence past the breaking point and shatters the suspension of disbelief, in my view.
Modders don't (and shouldn't) make mods for me, outside the times when a modder deliberately takes on a request here to do so--that's both expected and how I prefer it, so I'm not asking you to change your vision in any way. This is just to let you know that it sounds like the kind of project I probably wouldn't include in the builds.
Well, that is indeed the problem as I mentioned in the original sting for the use of the Tomb. I'm in no way attached to using the tomb specifically, but at the same time I don't think that just because it still has loot in it in KOTOR 2 there's no way to use it in the original. If the PC enters the tomb and it's established that his visions are much stronger than the ones the Exile experienced because of Revan's much stronger connection to the Force, the entry to the tomb could be treated like a sort of bad trip where the PC is almost completely out of it through the entire tomb, and only regains sense when they leave, never taking anything significant with them.
Though I reiterate, this is mainly just a thought exercise on my part to argue that even seemingly-unusable modules can probably have the gap bridged with some creative concept for their use. I think not using Kressh's tomb would probably be better.