If you are going to stipple, that will be FMQ and require feed dogs down and the darning foot.
If you are going to stitch in the ditch, it'll be a walking foot.
No matter which way you decide to quilt it, it is best if you start in the middle and work your way out.
What I have done on some D9Ps is SID around the whole D9P block creating a little grid on the back, then I went back over it with the darning foot and stippled and doodled in one block at a time. It was pretty fun.