IME, enlightened, flexible employers are only too happy to employ SAHPs as freelancers.
IME, the right (best) freelancers can demand as few hours as they wish, because their employers are chomping at the bit for them to get hold of them.
I don't personally agree that working a couple of hours a week/month, in the evening or whatever, compromises being at home with the DC. In fact I feel it secures the best of both worlds. I feel it has to be the way forward for parents of both genders in many industries. Sure, you'll be a little tired. But aren't we all tired, all of us, all of the time, even before we had DC?
Fair enough if that's simply what you don't want to do. But the odd bit of freelancing just seems like a fairly lucrative AND low-key way to ensure that you don't run into the type of interview problems described upthread whenever you do eventually want to go back to working full-time.