I guess that CheckAssociations addon was generated because there wasn’t a quick method to select people with associations data? That’s also why I was surprised you got it with few lines of code…
https://gramps.discourse.group/t/new-gram-py-script-for-6-0/7192/11?u=romjerome
Feel free to deprecate CheckAssociations addon. It still does the job: provide a way to check Associations into our database, but without advanced features, like a way for fixing some mistakes on seizure.