I learned a drill similar to this from a top professional player (world champion actually). I usually do it if I haven't played in a few days, or If I feel as though I am not delivering my cue straight. I align the OB and CB in a straight line from corner to corner, just as this shot is laid out. I move my CB back, just to where I can make a comfortable bridge on the slate, slightly above the Jaws of the corner I'm shooting out of. I shoot stop shots tell I make about 10 to 15 in a row. Then, I try to draw the ball back into the corner I'm shooting out of, and lastly I make the OB and try to intentionally follow the CB into the corner pocket. When I successfully pocket just a few in a row (doesn't take much) on the follow stroke, I have all the confidence in the world because it is the absolute straightest you can cue a ball if you can put that much distance between them and follow the CB in right behind the OB.
Another good one is to set up long straight in Combinations, and try to pocket them.
Gotta agree with that one, great way to warm up & get yourself ready to go. A variation I add is to play shots of the same length but with a slight angle & put the CB tight against the head rail. I like to start out hitting the CB just hard enough to make the OB & leave the CB on the bottom rail, gradually working up to bringing the CB back up the table.
This always loosens me up & makes me feel like I've "got my eye in" as we used to say back in England!