We could build an iOS app if necessary.
Dang, that’s dedication. No need for that from where I stand. Besides, I already made a shortcut. 
But seriously, yes, the notifications would be nice, but also the forum consolidation in one app. If you have any pull with Discourse, let them know. I assume they don’t have their own iOS app? Maybe they should. I use a ton of forums and don’t believe I have any others using this.