I don’t think it matters where you post, someone will answer you.
I find it a bit strange to have appointments with the MS nurse gatecrashed by OT and PTs. It’s never happened to me. In my area, the MS nurses have a lot of contact with the Community Neurological Team (which includes PT and OT), but they are separate. So the MS nurse might ask a PT to see me, but that would be independent of my appointments with the nurse.
It’s surely important for you to develop an individual relationship with the MS nurse. S/he will be the person who can bring together all the strands of your healthcare after all.
If you have an email address for the MS nurse, why not send her/him an email politely requesting an appointment with just the two of you present. You can surely explain that there are aspects of your health that you are happier to discuss in a more confidential meeting. And after all, discussion of (for example) disease modifying drugs, or bowel and bladder issues, or pain/drug treatments have nothing to do with physio or occupational therapy. Equally, if/when you see a PT or OT, you’d prefer to arrange to see just them. Seeing a physiotherapist is not useful if there are other specialists present.
The more I think of it, the more odd it seems. I’ve just seen my physio. We discussed physiotherapy, exercise and my physical condition generally. I email my MS nurse most often, we discuss completely different things. Like drugs, symptoms, relapses, bowel and bladder issues. None of which is relevant to my relationship with the PT.