[kdamica]

Have you tried creating a YouTube Kids profile? What you’re describing sounds like what they already have. It is not the default but there is a setting that allows you to create a list of allowed channels. The setting is called “Approved Content Only”.

[watwut]

YouTube kids is a wasteland for non English content. And also, there is whole world of content I would be more then happy to encourage my kids to watch that is unavailable there.

While also containing huge amount of unboxing toys crap I would not give to my kids in my own watchiles.

[modeless]

You can share almost any video on YouTube to the kids app. You use the YouTube app on your phone to share it, not the UI in the kids app.