I think the Force healing works thematically, it’s just on a lore/continuity level that it fails. For that reason, I think it could work if we make it so that only dyads can heal each other. Pretty much all you need to do is cut Rey healing the snake and have Palpatine or somebody clarify that this is a property of Force dyads.

And I absolutely agree with StarkillerAG on Rey’s parents. Rey Palpatine doesn’t work, we all agree on that, but Rey’s parents ditching her to protect her does. The thing is, Rey’s parents being drunkards works far better.

I suggest we have someone mention that First Order troops have been sent to Exegol. That way, we’d solve the “where did this army come from?” conundrum. As for where the Star Destroyers came from, we could have them say they were stashed there during the imperial days, explaining their imperial design.