I’d be hesitant to have any specific “chosen one” element, since we’ll also want it to work in the Rey Nobody version. Also, RogueLeader, correct me if I’m wrong, but isn’t the intention to do away with the whole “On the southern shores” bit, and just have the location revealed to Rey alone? In which case, the only possible place to include the vision would be when she picks up the Dagger on Kylo’s ship, because after that they’ll have to already know to go to Endor. Maybe there’s a line from her first lesson in TLJ that could be used as she’s approaching the Dagger? Something like, “Feel the Darkness…”
Also, regarding the vision, perhaps we could work in some shot from Return of the Jedi, to help break things up? Like, “This is Palps putting the Wayfinder on the Death Star” kind of thing, and this is what it looks like now [quick shot of current Endor wreckage]. Maybe even a shot of the planet/moon itself?
For dialogue, maybe the transcription on the Dagger could say something like, “The Wayfinder will be revealed only to those who embrace the power of the Darkness.” I don’t think it has to be super long or flashy - it’s carved on a knife, after all.
EDIT:
One of the keys to the new translation has to really imply that the dagger will guide the “chosen” one. SO even with Orchi, who had possession of the dagger and logically could read it, it doesn’t guide him to anything. It wouldn’t “talk to him” in anyway. So something that points out it works only with the “chosen one” is good to have. So it’s not about it leading to the wayfinder specifically, just guides her towards the throne, which in this case, the Wayfinder is needed to navigate to Exegol.
Why can’t it just be used as a guide for anyone who follows the ways of the Sith? Like, Ochi could have been on Exegol at some point. He could have been guided there by the Dagger. Why have it only work for Sith Royalty? I don’t follow.
Hell, maybe all of those Sith Cultists and ship crew got there by following similar Sith artifacts; but Luke wasn’t able to track any of them down because, as TLJ shows, he would never truly embrace the Dark Side.