I made Hive Plug & Play to solve the custom_json op filtering and search problem for Hive. With it you can search and subscribe to custom_json ops from a particular id such as podping. You can either use the public node I have made freely available (https://plug-play.imwatsi.com/) or run your own node and customize it (https://github.com/imwatsi/hive-plug-play).