Just in case someone comes across this post in the future, here are some alternative solutions:

https://www.youtube.com/watch?v=s8uX3LVx21E

https://www.instructables.com/LED-Piano-Learning-Strip/

https://www.amazon.com/ONE-Music-Group-Beginners-TOH1/dp/B075XLPBQT

I'm sure there are more solutions using the same concept.