I would stitch in the ditch only around the star that is whole (the one that is just below and to the right of the center of your quilt in the picture). Then I would simply echo around that one star until the entire quilt is quilted. That would be very easy to accomplish in the time you have available and could either be done FMQ or with your walking foot. You would end up with concentric echos around that one star and as you got further out, your echoed line would run off the edge of the quilt, so you wouldn’t have to worry about the binding interfering with a pattern. Also it would have the effect of being an all over texture that would reinforce the shape of the main star and also the spiraling out effect of the pieced pattern without overwhelming the rest of your lovely piecing.
Rob