@jarjar I get your points and you are not wrong at all. Especially if you want to keep the “purpose” of the dagger as it is, but just less goofy than the original cut of the movie. Which is already a great step in the right direction.
However, if one of the ideas is to have the dagger appear to be ancient, at least specifically, prior to the events in the original trilogy, having it not be specific to Endor would help sell it. As to whatever it says, I think your thinking that anything that is not specific to the location a la C3PO than it ruins the plot/purpose of it.
I don’t personally think it does if you view it in this context (If the dagger says something more on the lines it will lead you using the dark side, or whatever).
Rey has used the dark side previous, or at least “followed” that part, or at least the “shortcuts that lead to the dark side” in The Last Jedi (and arguably TFA with the final saber battle, though that is debatable and not overt like in TLJ). Rey sees the Dark Side Hole, Luke explains it is strong in the dark side. What does she do? Well, she “dives in” via vision. Even after Luke’s freak out after her doing that … what does Ray do? Well, after, again, knowing it is from the dark side AND PROVIDES INFORMATION/HELP (it was after she did that she talks about not seeing Luke in the Force AFTER taking the vision plunge) she goes back to it for information to help her. In a way, she was using the dark side … for good intentions in her mind. She wanted to learn her parent’s identity. So again, she ‘choses’ to dip into the Dark Side.
So now, flash forward to TROS. Specifically at the confrontation between Palps. Palps reveals she has to kill him to save her friends. Again, taking the short cut (that leads to the dark side) for something she needs (save her friends.) You see the conflict this time since there is an actual cost to her decision. Just think about this. If Ben did not come … what would Rey have done? We don’t know, she may have chosen to kill Palps since it would mean sacrificing herself, but stopping the attack on her friends. But with Ben coming, she chose the right decision (the hard one to team up with Ben to go up against Palps and his guards/knights) to face him.
So now to this dagger, if one was to go the route about it more like using the dark side to lead the person to their desire or way to exegol or whatever. How does Rey know what the dagger does? 3PO translates it. Before deciding anything, FO comes and the plan is to save Chewy after she senses him. When she is on the destroyer, what does she do? Go to the dagger. She has the knowledge that this Dark Side thingy will lead to what she wants/needs. Again, for good intentions to save the galaxy from Palps if she gets the Wayfinder to go to Exegol. From this point, she decides to use it and that is when the dagger begins to speak to her, since she chose to retrieve it and use it knowing she would have to use the Dark Side.
So the dagger leads the person (or who it choses) to what they desire or something like that. So it’s not Orchi’s dagger, but using it to find and kill her parents. It could be revenge. And if you do add the whole “choses” or whatever, can explain why Orchi couldn’t find Rey since it “stopped talking” or whatever.
We already have places and things both sides of the Force are either strong with or contain, so having a special dagger isn’t something too random. The dark side, as previously explained is the person taking short cuts using the force which eventually corrupts the individual. So that is the conflict for Rey. She’s used the dark side before, but hasn’t bore any of the consequences. Is it that bad to use, for good intentions or for good reason? That is the final choice at the end of the movie, which she choses not to do, hence her resolve not to and she is “rewarded” in a sense she finally connects with the Jedi.
EDIT: Yes I know I am over thinking things, just trying to come up with an idea to make the dagger more ancient, powered by the dark which Rey choses to use and why Orchi originally had it. LOL.