Well, here’s the tricky thing actually, with the new angle we’re taking with the Dagger, it doesn’t really say the “Location of the Wayfinder” anyway. Personally, I still think Sith Runes are enough of a giveaway to accept that the Dagger is important.
Besides, Rey senses something fishy about the Dagger, so clearly it means more than Ochi’s special knife. How many artifacts, carved with ancient Sith Runes, imbuded with pure Essence of Dark Side, discovered near a confirmed Sith Cultist, are we reasonably going to find?
I guess my question to you would be what are the odds that this one random artifact filled with scribbles happens to be the one thing holding the key to finding that particular thing they’re looking for? And why would 3PO, who is all about the odds, be so excited and sure that it is the one thing they needed if he doesn’t know what it says? Even if we remove the location of the Wayfinder from the inscription, 3PO’s reaction to seeing it wouldn’t make sense unless he knows for sure it IS the clue they were looking for.
As for the new inscription, maybe it could end with something like “to those it chooses, only this blade tells”, this would reinforce the idea I was talking about earlier of the dagger reaching out to Rey from the moment she picks it up (instead of “I can hear my momma scream!”), and the idea that those same whispers can guide Rey on the DSII as it’s already implemented. And it wouldn’t make it all about Rey, she would simply be “chosen” by the dagger, maybe implying the dagger can sense the darkness growing inside her, but she wouldn’t be a “Chosen One” in any capacity.