So I love BTT and have been using for multiple years. I finally checked out the iOS remote app which is surprisingly awesome. A majority of my time I'm stuck at work on a corporate network where my iPhone and Mac can't talk to each other so 99% of the time the app is useless.
I was wondering if you'd look into a bluetooth connection using the Multi-peer connectivity framework from apple. Speaking as an iOS developer its ridiculously easy to implement into an app and it would be awesome to be able to use BTT remote while at work.
Framework is here:
https://developer.apple.com/documentation/multipeerconnectivity