So why don't you move to cloud/managed services? I can tell you from own experience that having a HA solution you don't really understand is a really bad idea.

So why don't you move to cloud/managed services? I can tell you from own experience that having a HA solution you don't really understand is a really bad idea. Just go with master/replica for Pg and a well documented troubleshooting and manual failover procedure. It'll likely be more reliable than some HA black magic. And it will likely take less than several weeks to get up and running.