I think there could be something there, just needs to be tweaked. I recently came across this tool: https://www.tillerhq.com and instantly signed up. Think it's $10 a month or less. I think they do pretty good as well.

All it is is syncs your bank data to a Google Sheet and has pre built templates.

It doesn't have a great way of doing graphs tho, i'd love something like your tool but for analysing my transactions (not saying you should focus on that demo)