Stating up front that I've never used Saxon Math, but when I googled the Power Up from Saxon, I do have a connection I think would work.
The Power Up/Mental Math components seem to me to be a good match for the Math Daily 3 Mini-Lessons. I really didn't see how much time these activities take, but if you keep these lessons short enough to match what brain research says, it seems that would work well.
I'm interested to hear from others who have done Saxon Math to see if they agree.
srea