Looking for some advice with a friend

I have a dear friend who is an adolescent with severe Autism Spectrum Disorder. They're non-verbal and very fidgety, and just this week they were diagnosed with Type 1 diabetes. I'm helping their family develop a plan right now, and I wanted to see if any of you fine folks had any advice for ways to administer insulin for someone afraid of needles and who will most likely fidget with a pump. I know about inhalers for rapid-acting insulin, but we need a way to safely a reliably administer long-acting as well.

Also this person is non-verbal and unable to communicate how they feel. What are some signs I should be looking out for that might indicate high or low blood sugar?

Any advice would be amazing, thank you all so much.

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Edit: Thank you all for the responses so far, your help is so appreciated by both me and my friend.