I haven't joined MediaParents but I get their facebook mailings. People I know have got work from it. As for working part-time, it's a tough one, isn't it?
I work part-time from home for a big Indie, but I have had to step back from programme making, although I do help out sometimes with productions in a Dev. Prod. role. I know quite a few Development Producers who work part time, but I haven't come across a part-time Producer/DP.
Skillset (ITF??) have started a new course aimed at people just like you/us - women wanting to get back into the industry after having DCs. It's called Creative People Women Returners' Workshop (aka, confusingly, as Reviewing Your Career Options). It's well run, gives lots of food for thought and there's a lot of practical help you can tap into after the course too. Worth looking into.