Sounds like you have a solution, but I wanted to throw in another vote for an Opinel 6.
This was what my son earned on his 7th birthday. He had used my knives prior to that, and had a small camp ax at 5, and a customized kitchen knife at 4, all used under close supervision.
I customize the Opinels with a drop-point blade for sturdiness and a hole in the end of the handle for a bright yellow paracord lanyard (for finding it when he misplaces it, so far he has only lost 2…

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I feel this is the perfect first folder for him as it has a simple lock, is a simple knife, a perfect size for him, and with the reasonable price I could order several to have on hand, when he eventually lost one or two... It also is more traditional looking.
I prefer basic for first tools, like his gun, an original fully restored Chipmunk .22. Basic, traditional bolt action. This way he focuses on the care of the tool and mechanics of how the tool works before anything else.
He has other knives in his collection, but the Opinel is his carry on our homestead and when we go camping.
He will probably earn a custom fixed blade (by me) when he turns 9 or 10.
I also gave him a handout from AKTI and the book How to Make Wooden Folding Knives by the Kleckers. I thought this book was a good one to read with him as it has care and use pointers as well as history. My son is not so interested in making wooden folders (yet, he is mostly a fixed blade maker), but that info is there if he wants it later.
Good luck and enjoy; the first knife is a big deal; it was for my son. And hopefully the second and third and … can be also.
Brome