@Glitterfarti
Amazon sell child sized cuffs. Maybe there is a suitable one for your machine
I also do not think you should just be taking the GP advice especially as your dd appears to continue to be losing weight. Letting your dd go feels perhaps as though it is rewarding the ED as she has no incentive to work towards being allowed back at school… I am presuming school is something she really wants to attend. I get it’s really really hard when you’re in the midst of this.
As for getting a private assessment, I have decided against it with dd as I was told by the private ED coach we are consulting that her likely autism is confusing the issue as she doesn’t have the normal fear food responses. The coach said that it is likely dd also would be told by them that she doesn’t have an eating disorder (which would be extremely damaging for dd’s health as we are still feeling the repercussions now of dd being told that by CAMHS approx 3 months on). I do think it would help dd though to have a diagnosis.
What are you hoping to achieve from a a diagnosis? For me, I would like dd under CAMHS so we have access to help and as I said it would be useful for dd. In my experience of everything else it seems unnecessary. eg When dd sat her GCSEs earlier in the year, the evidence the school sent the exam boards was accepted even before the GP produced a letter confirming the situation. When we called an ambulance to dd a few weeks ago, the crew accepted my say so that dd has anorexia and was discharged undiagnosed (pretty obvious when you look at her). The GP also accepts this.
If you have specific issues, you could still contact CAMHS for advice. In my experience the nurses are brilliant and a lot better than the people doing the initial assessments. We have a 6 month window to get dd back in so during that time it appears I have access to the nurses over the phone. Maybe it’s the same with your service, especially if you raise a PALS complaint, which I have when dd was discharged.