Regarding all the discussion about turning Pasaana into Jedha, I’m totally down to help with that! That’s a change I’ve wanted to make from the beginning, there’s several ways you can implement this change in interesting ways, and there are a lot of good reasons to do so, I think.

I think if one were to try to get rid of the superweapon aspect of Starkiller Base, you could make the mission 1) Get the the other half of the map to Skywalker, and 2) Rescue Rey. It would make a lot of sense to make this change, since most of the film revolves around the search for Skywalker, then it gets sort of forgotten in the final act in favor another “destroy the superweapon” climax.
Instead of Han and Finn capturing Phasma in order for her to lower the shields, you could change the screen graphics to show the larger portion of the map that they need. Basically, Phasma is forced to give them the other half of the map, which Kylo Ren says they have at different points in the film. So no planetary shield, they drop out of hyperspace close to the planet only to not be detected by their sensors.
By implementing new computer screen inserts, as well as First Order officer/X-Wing pilot off-screen dialogue, you could reestablish the Oscillator as a planetary-scale tractor beam. After Rey escapes, the First Order could activate it so she (nor the Falcon) can escape. This is when the Resistance swoops in to try and help destroy it so they can escape with the map. They struggle with destroying it, which is when Han and the gang come in with their explosives. The “tractor beam” explodes, but the end is altered so the planet doesn’t explode.

And you would just cut the Resistance briefing scene because it actually isn’t necessary if you think about it.

Obviously easier said than done, but I think the best reason for even wanting to try this approach is for the fact that it keeps the movie’s focus on finding the map to Skywalker from beginning to end.