You could look at setting up a discord bridge on the matrix server to bridge messages between the two. Pine64 have had something like that for quite a while on their discord & matrix.

Also echoing what’s been said already, I did initially think this was some air pods style product from Pine64, as they prefix almost anything they make with Pine

You should be able to update the config file for SearXNG to add the port to the URL. Then just restart SearXNG; removing and re-adding the search engine to Firefox should make sure it’s updated to use the correct port. In the settings.yml file, under the server: section is the setting you want to change:
base_url: http://192.168.1.65:8887/
Leave port: unchanged