Trying to avoid being That Fanfic Writer (or Artist)

The problem:

I make fanworks (fic, art, and comics) which (since they're about people) touch on issues like race, class, gender, sexuality, disability etc. There is always the danger with these works that I've inadvertently made something Very Hurtful that I won't notice until someone points it out to me. If I just chuck stuff online based on my own judgement it could do a whole lot of harm before someone points out the Fail, and then I have to figure out how to fix it. (If your response to this is that I shouldn't worry about it, this post is not aimed at you but, for example, Racefail: same shit, different day is. I do not feel like arguing with you)

One common solution offered for this problem is being beta-ed, but this doesn't work for me. (Research and mindfulness etc do a most of the time, and thus I do them, but they're not entirely reliable by themselves)
( Possible solutions )