11+ for child with dyslexia and slow processing in North West England

[kaffkooks]

I'm going round in circles trying to decide what to do with DS in year 5. He has recently been found to have dyslexia and main issues are handwriting, spelling and slow processing. Assessment also showed above average intelligence. His reading is slow but good. He loves learning, constantly asks questions, has an excellent memory which helps to cover his other difficulties. I can't decide whether or not to arrange tutoring to do 11+ for some independent schools in the North West. I worry that the pace of the work will be too quick for him at an independent school although he is intelligent enough to do it. On the other hand, I worry that the big local comp, although good, will not have the resources to support him in the current economic climate.
It seems that assessing "intelligence" for 11+ is based on doing things quickly. He would be amazing at an interview as he's chatty and bright but he'll never get to that stage as they won't be able to read the answers on his English exam paper!
Anyone else had this situation? What works for children with dyslexia at secondary school?
Any good schools in North West state or private for an intelligent boy who loves learning but needs to go slowly?

We are in North West! It depends where you are - The Grange is good in Cheshire? That was our top choice. Some of the 'better known' schools in Manchester I've heard mixed things about from parents but that's just my experience.
Our middle son is dyslexic, and we originally looked at independent schools both in the NW and also in London, but on balance we've gone with the state plus option as the comps near us have better support for children with SEND and we work with a wonderful lady called Jo Austin (google her - her company is Tayberry and they're the experts on schools round here!) who does all the extra stuff and ensure he doesn't fall behind. We were going to end up paying anyway for 'dyslexia support' at independent school, so instead we've put the money aside and spend it on his lessons.