EOTAS absolutely is not a myth. There is an increasing number of children and young people in receipt of EOTAS. I have 2 DC with EOTAS and have supported others to secure the same.
But, as I have already posted, many have to appeal. And that is how you can secure it if it is inappropriate for provision to be made in a school. So, if you didn’t want to EHE, did you appeal? If not, and you want to pursue EOTAS, do you still have the right of appeal? If not, you can request an early review in order to try to secure the right of appeal again - IPSEA has a model letter you can use for this.
Representation isn’t required for appealing, but if you did want it, you could look at Sinclairs, Simpson Millar, Watkins and HCB solicitors.
As I said, EOTAS packages can include whatever special educational provision (the definition of which is actually wider than many realise) is reasonably required. That includes professional involvement.
Relationship building can take a long time. Far longer than since the start of your thread. That is normal for some DC and doesn’t mean you will be paid.
In the meantime, if you no longer want to EHE, you can inform the LA you are no longer EHE and they need to make arrangements to ensure DS receives a suitable full-time education and anything detailed, specified and quantified in F of the EHCP. If the LA refuses, delays, or ignores you, you can enforce the provision. Email the Director of Children’s Services threatening judicial review for failure to provide provision under section 19 of the Education Act 1996 and for breach of section 42 of the Children and Families Act 2014. If that doesn’t work, you need a pre-action letter. SOSSEN can help with that. Although there is a wait so some choose to go elsewhere. Then, if that fails, JR itself will resolve the situation.