I have a hypothetical question. Does a program such as the one that you worked under need to be in a hospital setting or would a clinic or other practice benefit from such?
If it could be done anywhere why not try to get the clinic you worked part-time to allow you to start one there if you have a good working relationship with them? Or somewhere else even. Hospitals are not always the best places to work. New directors or other supervisors change things to suit them, not the workers or patients and the inner politics is rarely good. If it can go over in an office type setting it might be an even better fit for you. You helped build the other program and I am sure that you know enough now to build another one, and many of your old patients may seek you out if they know you are there unless they were in the hospital at the time. There may also be other hospitals in your are within driving distance that does not have a similar program that would be glad to refer to you on an out-patient basis. There are tons of grants out there to be had. It takes some digging sometimes to find them and write the grant proposal but it could very well be worth the time and effort if it could get someone else to take you on by having a grant to pay your salary or part of it in the beginning until the patient base is established.
Going back to the hospital may be the easiest way to pursue your passion from where you are now, but I am fairly sure it is not the only way and it might not even be the way that you will be happiest.
Just wondering because I think you would be awesome at doing your own program without the hassle of a hospital setting.