This sounds sort of like what Remarkable[0] claims to be (not affiliated). I pre-ordered one because I'm very similar with my notes - I have a ton of ad-hoc notes taken on legal pads floating around.
Context: every time Remarkable hits Hacker News I'm intrigued, but I couldn't pull the trigger on a pre-order. I love the idea they're selling.
The customers at the top of the preorder queue for v2 got their tablets about a month ago[1] so the number of people able to write such a review will be limited for the next month or so.
Worth noting there is open source tooling for modding/ssh access to remarkable tablets[2].
[1] https://support.remarkable.com/hc/en-us/articles/36000264587...