Welcome to the forum.
Club Car has different length columns. I have some that are two to three inches shorter that stock. I don't know what models they are from, but they are out there.
You can cut the steering shaft and clamp in a piece of angle iron to weld, just make sure you leave a relief on both parts so you can get a good weld. The aluminum tube can just be cut to match.
I had an employee cut 4" out of the column once. He cut the 4" out of the shaft and re-welded it, did a wonderful job, but then he cut the aluminum tube in two and cut 4" out of it and re-welded it... The tube is aluminum and the same diameter.