Reddit mentions of Hastie Studio Piano Scale Cheat Sheet Finger Charts

I found it! For anyone that stumbles across it in the future...

Here's the perfect book as $6 digital PDF

https://sellfy.com/p/9eM3/

And the exact same book sells on amazon for not much more

https://www.amazon.co.uk/Hastie-Studio-Piano-Finger-Charts/dp/1461136962

I've also found this sheet a good way to keep track of my progress...
Goal 1 would be 'hands separate, at 80bpm' then goal 2 might be 'hands together, at 80bpm'

http://www.bestpianoclass.com/wp-content/uploads/2015/12/Ultimate-Piano-Technique-Goal-Sheets.pdf