Turns out there is a thing like I'm imagining, which is unsurprising. What is surprising is that it's 800 fucking dollars lol
https://www.celestron.com/products/starsense-autoguider
I was thinking it would be cool to have a little add-on that did that for like $100-150 (plus camera and guidescope). $800 is ridiculous and pointless.
/ps