Although it hasn't been specifically mentioned anywhere that I'm aware of, it's probably fair to assume that even 'no sex' dommes will be classed as sex workers under the pending new laws. Therefore visiting them would be classed as a criminal offence.
Are there any BDSM clubs in Belfast / NI or any other ways of meeting like-minded individuals without direct payment being involved? A quick look at fetlife doesn't suggest there is much of a thriving local scene but I'm happy to be proved wrong.