4.) The fight scene between Javert and Jean Valjean! That scene made me really want AU fix it fic where they have many adventures together and occasionally fall out dramatically. Sadly it is not to be.
Um... it is definitely to be, actually, unless you want strictly gen even in fix-it scenarios - Three Days (or The One Where Javert and Valjean Take a Road Trip Through France and Raise a Child) by Zamwessell is basically exactly this and it's also probably the most well-known and most-recced fic of the movie-renaissance fandom. There is also a ton of Seine AU fix it fic, both gen and slash, in recent fandom and some from older fandom as well.
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Um... it is definitely to be, actually, unless you want strictly gen even in fix-it scenarios - Three Days (or The One Where Javert and Valjean Take a Road Trip Through France and Raise a Child) by Zamwessell is basically exactly this and it's also probably the most well-known and most-recced fic of the movie-renaissance fandom. There is also a ton of Seine AU fix it fic, both gen and slash, in recent fandom and some from older fandom as well.