One update is I asked their GP if hospital was an option, and she said it would only be through either urgent care/A&E if their symptoms were deemed life threatening/needed immediate treatment, or through a clinic if my partner needed treatment or tests that couldn't be done at home. So, it's kind of good news/bad news that my partner shouldn't need to be hospitalised unless something urgent crops up, but also it means we have to wait on clinics for any treatment. The only clinic our GP has referred them to is cardiology, and apparently someone in my local ME group has been waiting 2 years on that list....
So seems like private treatment really is going to be the best way, it's just up to us/me to find the right one.
(On a crappier note, my partner let their GP come to do a home appointment for the first time since last December, since they needed a potential ear infection looked at, and she was AWFUL. It's like she hadn't been listening to a thing I've said the past seven months- speaking loudly, asking why my partner had an eye mask on, asking if my partner could "stand up for just a sec", asking loads of questions....so, she's not allowed back, and after I have a talk with her, if she still can't seem to get it I'll be looking at finding a new GP. It also maybe helped show my partner why I've been so against hospital this whole time, they thought I was being overly pessimistic, but if this is how a doctor that's been treating them for a year acts, now they can maybe see how hospital doctors and nurses could be harmful to them)