dave, I built (and, more importantly, released!) a thing!
It's very early stages but it's actually functional.
It's a Vue.js plugin for building Excel Add-ins. Such broad appeal, I know.
https://github.com/demsullivan/vue-excel
This project is actually a byproduct of another big thing I'm working on.
Currently, I use YNAB for budgeting, but I've been putting sustained effort into getting my data out of the cloud and self-hosting everything.
I started researching options for budgeting software, and I really couldn't find anything I liked or that felt like it had enough features.
I decided, then, to just whip up something in Excel... which led me to the discovery of Office.js and the ability to build Add-ins for Excel using web tech.
Thus, vue-excel was born.
I may eventually release my budgeting tool for Excel, when it's feeling a little more mature and stable. Stay tuned... ❤️