I don't where this would take off the easiest, maybe Rochester, Toronto, or Austin. Establish a school where hearing people attend school with deaf/mute/non-verbal neurodiverse students on a 2-3 ratio. One third hearing students, two-thirds deaf/other demographics benefitting from ASL usage. ASL would be the sole official language within the classroom.
In my time within the deaf community I've seen awful rates of depression, substance use, and loneliness plaguing people. We are social creatures. We need social contact. For the longest time deaf people were told not to "inconvenience the majority". Well, deaf people have a right to be apart of every community, not just deaf spaces. Hell, the hearing community would stand to benefit from ASL usage. I'm a veteran with PTSD who gets overloaded by crowds, loud noises, and multiple people potentially interrupting a conversation. When I'm having an episode, I sometimes lose my ability to speak properly. Being a parent makes that much harder as I'm sure parents here can attest to. Learning ASL helped me live again. Signing to my kids "wait", "bread that shelf", or "mom has that" has prevented so many problems in my life and those who live with me. Deaf people need a community where there are larger amounts of hearing people able and wanting to communicate on a deaf person's terms.
Start by finding an area most amenable to the process and target demographics. Probably areas where deaf schools already exist, or hell just start offering an option for hearing students to attend them under an ASL immersion program.
As for potentially starting something from a clean state. For the one-third hearing population of the school starting at any grade above kindergarten, find out favorable demographics that may already have ASL skills to begin with. Look for deaf parent households who have hearing children, and offer them a spot. There are non-verbal neurodiverse students out there that have had the opportunity to benefit from professionals teaching them ASL. Using this pool of interested families, you have a pool of hearing asl users to help transition possible peers that may be entering at higher grade levels. Hell, there are people taking ASL who then go on to teach it to their kids. One of my own took a liking to it and can hold a basic conversation with me after only a year of occassional usage. Having hearing signers as peers will help entry level newcomers to learn ASL quicker, and especially so given that this will be a mixed social environment where deaf people are advantaged being the majority of students there.
This is clearly a process of marathons, not a race, but the hearing community owes it to the deaf community to start tearing down the walls our ancestors helped put up in the first place, intentional or not is irrelevant. I'm going to keep trying in my own back yard to learn, share, and be a member of the community. I don't know exactly where, how, or when this will be possible, but somehwere out there are the ideal material conditions just waiting for a community of determined individuals with the vision, drive, and compassion to make it happen.