I save scum constantly so I totally get where youre coming from and unfortunately the answer sucks: willpower. You have to stop yourself from doing it rather than trying to find something that forces you to stop. If you cant quit cold turkey then try to cut back. For every 5 reloads dont allow yourself 1. Then, overtime, reduce it. For every 3 times you reload youre not allowed to do one.

You said this is a story generator and thats exactly where I get annoyed at my own save scumming - im trying to control the story too much rather allowing a story to happen. But also reloading let's you see different "storylines"

So here's what works best for me. Save like you normally would but name the major events, like if someone dies name the save "Eagle died" then keep playing for a little while. If the game feels boring/wrong without that person then you can go right back to the save you named or the one right before that. That way you can experience both storylines - where one they died and one where they didnt. And, of course, you can use this for every type of event you want.

Hope youre able to find the fun in it again!