that the white man stay back and simply make room for those historically dispossessed and disenfranchised

This is the beginning of answering your question. People make a big deal out of the phrase "you can't solve the problem with the same tools that created it," or something to that effect. How can the resolution to these problems be led by the same people who created/benefit/exist in them by default? The primary engineers and architects have to come from among those who have been victimized. You have to follow the lead of the victim.

Ultimately, while the while people are capable of complete empathy, empathy is not the equivalent of lived and living experience. If you cannot have complete understanding of these experiences (read: systemic racism, the problem), then you are likely not capable of defining what the solutions need to look like.

So at the moment

For one, these actionable items for concerned white males: besides continual awareness expansion and civic engagement, what more can we do?

Is something you should absolutely continue to do in the best capacity you are able to.

And when the victimized (read: minorities) begun to push back and create spaces in which all of their humanity can be accepted, you should likewise assist them in the capacity you are able to. So when minorities band together to try and push political issues relevant to dismantling systemic racism, support them. Don't try an recenter the action around what you want to do because it isn't about what you want. It is, fundamentally, about what we want.

Always welcome to reply and I hope I havent made you feel threatened. Apparently, I'm prone to do so when speaking on this.