I wouldn't mind doing such work if I could do it from home. If I had to travel and also pay for childcare, it wouldn't be worth it. Do any businesses that you know of offer proofreading work from home?
I can't vouch for the links, because I haven't checked them out yet, but look on my homepage. Someone else was looking to work from home, and I bookmarked the thread.
Childcare is the deal breaker. It's what has kept me from real employment for years.