My sister works and homeschools, has always worked part-time, but some years just shy of full-time, and my nephew is in 6th grade now (with my niece being 3 1/2). It's working really well.
I also have a friend who teaches college chemistry and homeschools; she has 8 children, although the oldest 2 are off to college and the youngest are still preschool age. Her dh's job requires him to travel extensively; I really do not know how she does this. Their older children have turned out beautifully; warm, creative, intelligent, fun to talk to, and the 2 at college doing very well.
If you can't work up to "indispensible"
, maybe teaching for awhile would still be an option? Seems to be a pretty flexible option to have as a back-up, anyway.
Y'know, this is probably a separate thread, but don't feel badly about your dh. It seems like in the homeschooling magazines Dad does science, math, and great field trips, is actively interested in curriculum selection, and gives Mama regularly-scheduled teacher time, but uhhmmmm, I'd be interested in a poll of real people on that image
All of this to counterbalance: I couldn't do it myself. I worked while beginning homeschooling with my first, and it did not work in the least. I think it's a personality thing, though. But for me, homeschooling did not work very well until I came home full-time.