Use a longer club (I use 2 clubs longer). A 3/4 knockdown swing with this longer club should give you roughly the same distance as a full swing with the shorter club.

Assume your normal setup. For me this means:
- gripping so that my clubface is neutral
- I don't choke down
- my hands should still be in the middle when I address the ball

The only modifications I make are:
- aligning about 10 degrees to the left of the target
- move the ball back a couple of inches. The forward angle of the shaft is created by the ball being back and not by moving the hands forward - leave the hands where you would put them for a normal shot.
- perform a normal 3/4 swing.