If you are offering a clincical intervention service as a certified specialist, and you have a sucessful history of bringing about measurable progress (with standard clincial measurment tools) for children with Dyslexia, you should be able to make connections with private practitioners who diagnose (but do not treat dyslexia) to make referals to you for intervention.
As an educational advocate for children with disabilites, I always caution parents about seeking evaluations provided by businesses who have a service to sell, especially if they design thier own evaluations, because only standardized evaluations are usefull to them if they wish to seek compensatory service or reimbursements from a school who has dropped the ball.
Schools have an affirmative obligation to provide service, and parents are within thier rights to seek appropriate services if the school does not provide it, and then seek compensation, but they have to be able to prove thier case by meeting a very narrow set of circumstances to do so. If your services fit this category, you should not have any difficulty finding clients once you have a repuation as a solid intervetntion specialaist.
I have to say, my antena always goes up when I see someone "promoting awareness" when they are promoting a service, even if it is a legitamate and effective service. I would suggest that you rephrase and affiliate yourself with a clincian who can make referrals for you.
M.