We have put work into criteria-based membership in notification topics. The idea is that rather than having to add/remove people from Bridge topics, you can register for push notifications, and then if your account has certain data groups, subsidies, language, etc. you'd get push notifications for that group.
The trick is that we need to register these folks in advance with an SNS topic. The documentation for the original work (such as it is) is here: https://docs.google.com/document/d/1OE0CdFlqMhnSV3GbLJpmYdk1CZ2hMFYGbpSX-Pv3Gig/edit#heading=h.1wo7rs4y68fk