Is Peergos the answer I'm looking for? If so, what's missing is a big push on the business/PR side. They'll need to replicate what Signal did for chat so that even my 80-year old mom can use it.

Any other alternatives?

You're absolutely right. We need a big push on marketing and PR (Peergos founder here). We are self, grant and customer funded and a not-for-profit so we necessarily need to grow more slowly than a VC backed company, but that lets us keep our incentives aligned with our users. Our aim is absolutely ease of use, there shouldn't be a usability tradeoff for privacy in our view. We do already have some very non-technical users who love it.