As I finally get through this (and I'm glad I did put it off until I was in a better mental state, I can imagine having wound up a complete mess yesterday), I think the reason it hasn't been done before is that to do it well requires a load of research that much of fandom doesn't really do.
I've played a tiny bit with the TB (most notably Mireille's death in Corner of the Sky), and at the time I was writing that, it was very difficult to get reliable information on the progression of tuberculosis when untreated if you had no idea how to navigate the medical presence on the web.
As I said in my FFN review, I think it makes sense of one of the older fic tropes, the sort of suicidal nature of this particular émeute. Only it actually makes sense, and for Enjolras alone and the fraternity he has built, and solely in his own desire to die on his own terms rather than from this disease. (I also wonder if he ever wondered "Why can't I even manage to get cholera? Lamarque got cholera!" Not so jokey, of course, but in terms of anything at all being a "better" way to die, something quick and blameless and more in keeping with his personal philosophy. Because "consumption" was killing everyone right and left, regardless of class, but it got pegged as the beautiful disease of the rich, of poets and artists, while the millions who struggled and died in the dirt of the slums were ignored by the standard tale. Cholera seems pegged as as much a working people's plague as anything, which is something Enjolras would prefer to be joined with.)
Wow, I'm rambling. Uhm, great fic, and I sort of cried
What kind of literature and what kind of life is the same question. - Tom Stoppard