There's at least one comm on Reddit where you could ask active sex workers about this, and I'd assume they'd be helpful. There used to be some great ones on Tumblr, but after one of the anti-sex content purges there, most of the ones I learned practical things from quit the site in disgust. And other sites have a similarly bad reputation for chasing them off when moral crusaders throw tantrums about their presence.

That said, with the caveat that I'm not in the business and may or may not be in the same country as you,
1. The ones I've interacted with seemed entirely willing to work with women and considered domming a fairly standard request.
2. They can probably help you avoid getting in legal trouble.
3. If you trust other women to make choices about what's best for themselves, then no, I don't think having a one-time or ongoing business relationship with a sex worker is "morally wrong."