coff33pot
"Randomized Control Trials" is are research structures / procedures used when validating a suggested therapy / cure for a specific condition. They provide the basis of a research program, which is then written up and published in a peer reviewed Research Journal. And then becomes part of the body research regarding that particular therapy, medication, diet, etc, used to guide and advise medical professionals, and therapists etc, regarding best practice etc.
Many of the therapies which many suggest on this forum have not been clinically tested using "Randomized Control Trials" or have not had a positive result from "Randomized Control Trials" which is why they can not be called cures even if they do provide some benefit on an individual basis or anecdotal evidence.
Your suggested three children would be too small a sample, and there would be no control group for comparison. But may be enough to gain interest / campaigning for clinical "Randomized Control Trials" based research
You may have to first demonstrate that there is a Scientifically tested, and accepted by the various medical advisory bodies, form of Occupational Therapy for a specific medical illness / disorder, and that there is a local/national demand.
There may be a need for more research in some specific areas, which may require funding, there may be a need for a new unit to provide the services required.
Setting up a lobby / support group of volunteers, a voluntary organisation charity, would need to the support and advice from the relevant professionals (research professionals, clinical professionals) to gain the required credibility regarding current technology and clinical understanding of the issues at the centre of the campaign.
You would have to first demonstrate that there is a Scientifically tested form of Occupational Therapy for a specific medical illness / disorder, and that there is a local/national demand.
Most existing charities have specific constitutions which define the conditions etc they are allowed to contribute to, or support. So you may have to start your own charity with its own constitution, which will have to find its own funding sources.
Regarding ASD there are many sensory issues, and each issue may already have an existing research program overseen by the Medical Research Council, at one or more of its many university research centres around the UK. So for instance Auditory sensory issues would be focused at the Institute of Hearing Research which has its main base at Nottingham University.
The other thing you need is a large number of volunteers to devote a great deal of their own free time and energy to run the campaign, which may have to run for years, and sometimes take on the most unlikely of opponents.