My young kids also watch(ed) plenty of Blippi. He has some episodes on Netflix too (different actor though) if you want to try that out. But it sounds like your

My young kids also watch(ed) plenty of Blippi. He has some episodes on Netflix too (different actor though) if you want to try that out. But it sounds like your best bet is to use a VPN and search "Blippi" on Youtube for videos to download. Amazon Kids, you could probably allow a file/music app that can play specific files. Overall definitely a big gap in the market.