Meg, Jo, Beth, and Amy is a racebent modern AU graphic novel, so I think it'd probably be considered its own fandom. The Time Garden, maybe or maybe not - it's a crossover, but relatively faithful in terms of tone & style. (I doubt anyone would bother ficcing it; the chapter or so in which Jo and Meg appear is actually pretty forgettable... for everyone except for me, because it spoiled an MCD for me as a kid, and I have yet to forgive it.)

I'm considering it! But unfortunately the inspiration fairy has yet to visit me.