I like the Eversolo A6. Some people around here seem to not care for Eversolo based on issues they have had. Some of them will likely chime in soon enough. My A6 and A8 have both been pretty much flawless so I’ve got no complaints.
The A6 satisfies a lot of your criteria but not quite all. It doesn’t have a headphone out, and I can’t say whether you will like the internal DAC more than your Oppo since they both have their own strengths/weaknesses.
The good part about Eversolo is that it is widely available. You can easily find it from somewhere that allows returns if you aren't happy with it. That's a huge benefit.