I’m sort of in the same boat, except I’ve been diagnosed recently. I’m now on tablets, but am not sure that I want to be, and am trying to gauge whether they’re worth the side-effects. Too early to tell yet. My diagnosing doctor was pretty adamant that while non-pharmaceutical treatments exist, they’re an order of magnitude less effective than medication.
Before I wanted them to have a phone, I got a second d phone. It was my phone, not my kids phone. I would let my child take it when they went for a ride, or stayed over with a friend, or whatever. But it was my phone. If I had to take it off them, I wasn’t taking their phone, I was taking my phone. The difference is important. It also gave them a chance to learn appropriate use, and normalised me being in control of it. By age 10-11 the phone was basically theirs, in their hands, but the control is still mine. So my advice is don’t give the phone to your child, especially it as a present. It’s more difficult to take something of theirs away, but if they borrow something of yours, it’s much easier.