It's entirely possible to get this going. There are the occasional posting for one of these kinds of jobs on the remote job boards. But also you could try worki

It's entirely possible to get this going. There are the occasional posting for one of these kinds of jobs on the remote job boards. But also you could try working with them for a while and then say you want to go down to part time. It's a lot easier to do this once they're already aware of your value, not to mention that you might be able to turn them into a more freelance-type client as well.