Here's a couple of basic banks using a contact point instead of the traditional diamonds. They can be made using no english and pocket speed. All banking adjustments, without saying, apply here.
The shot on the left is made by using the line from the pocket through the one ball with the contact point being at the back of the object ball. Aim the cue ball where the line exits the one ball.
The shot on the right is made by again, taking a line from the pocket through the seven ball, but using the front of the object ball as a contact point. Crossover banks use the front contact point. Cut back banks use the back contact point.
There are adjustments for straight in banks, thin crossover banks and thin cut back banks. Use pocket speed as these banks are affected like all banks by throw and speed. With a soft stroke they will be accurate to even where you aim at on the pocket.
You can use this method to bank a ball for a safety, too. Just figure out where you want to bank the ball to and find the contact point/line to get it there.
If these make sense, small adjustments will pocket almost any bank. Right now I'm working on two railers. More to come.
Best,
Mike