You can't use the same safety currently by just moving it to the other side of the gun. Had a friend who bought the same gun five years ago. He's left handed and called up HK about it. They told him to send it in to them and they'd switch it out with a left hand safey. Don't recall what the fee was, even if there was one. Give em a call, see what they say.
Try to put your tree stand in a tree with plenty of background cover, keep the prevailing winds for that time of the year to your face, and take care of those pesky squeaks and creaks your stand may have developed while sitting in the shed. A good treestand lube can be made by heating petroleum jelly until it reaches a liquid form. Some hunters have reported success by including a cover scent in this mixture before applying it to their stands.