The best solution to this at the moment is to simply search for user scripts in this part of the forums. Then, you can sort by ‘most liked’ to get the most popular ones. As for your solution, I’m not entirely sure of how viable it is…
Userscript Search:
https://community.wanikani.com/search?q=%5BUserscript%5D%20category%3A6
Edit: Also, this thread may be useful: