Like I said earlier on, I have tried that. It will leave you with draft in the wrong position and open the leech. You will not point well and the jib will not power up the sailplan as it should.
Try drawing some chords with 10% depth and draft at ca 40% forward on a sheet, then cut off the aft end and you will see the difference in shape. Such a small alteration really changes the sails characteristica.