We have had service delivery studies in ME/CFS going on for years under people like Chris Burton and they are the people who will submit proposals and be seen to have the credentials to do more of this.
Well, yes, perhaps the BPS people will put a proposal in. And, if they are successful, they will operate things the way they want and train the staff to believe the things they want.
But, there is also an opportunity for non-BPS people to put a proposal in. There are good people around who could make a convincing case for a non-BPS support service for severe ME/CFS. The non-BPS proposal could point out exactly how poorly the BPS services have performed, they could quote the Swiss research that found that people despair when they feel disbelieved. If the good people were funded, they would be the ones saying how things are run.
The people with severe and very severe ME/CFS are a relatively small group, and I think they tend to be pretty well informed. It surely would be possible to get some compelling quotes from these people to explain why they want a service, an agnostic service if you like. One that just aims to support and doesn't make any claim to know the cause of ME/CFS or how to fix it.
Right now, a lot of these people are pretty invisible to the NHS. One day, I hope fairly soon, there will be a treatment to trial with a reasonable chance of helping and we will want to know if it can help people with severe and very severe ME/CFS. If you have set up the support service that has tracked people's condition for a year or two, and you have nurses that these people trust, you have a perfect cohort to invite into a trial.
(Similarly, I think there would be scope to try to get some funds to trial a service in New Zealand.)