As long as you prune above the main trunk, you should be fine. It will push new branches out. Probably not a bad idea suggested by
@Gerris2, though. At 3' tall, I bet there's a beautiful caudex below that soil line. Have you never raised this plant at all?
Were you thinking something along these lines as far as where you want to cut? Just to have a squatter plant? If so, it should be fine.
