Update: I took the plunge and loaded Minecraft on my laptop.
Got him in a creative world for now First attempt he chose his own blocks and made me build a small house for him.
I'm happy to take the step and if he gets into it I'll get him his own account.
Lessons learned though
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I need to find a way of making the keys more accessible.
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A smaller mouse so his hand can reach the buttons again I need to get one that is more accessible with some texture for him
I'm blown away by the suggestions on here thanks everyone