The Molly fork of Signal now has a variant that supports UnifiedPush, but it requires a helper called Mollysocket to be installed on a server somewhere. I can't get my head around the (we'll call them 'lean') docs, and I've never encountered such a helper for other UP apps. They just ask what to attach to, and they attach.
Has anyone fought through this?
Never heard of Molly before. Will look into that when I find some time. Thanks for the hint ;)
you probably already found this, but for others who might be curious:
https://molly.im/
https://github.com/mollyim/mollyim-android