Old rose in an obelisk
We've recently moved house and have inherited a very old rose in an obelisk that needs some attention and I'm looking for some thoughts.
The 7ft triangular obelisk is leaning perilously at about 15 degrees and I suspect is only prevented from toppling by the rose! The ground has sunk away on one side - and is going to be a pain to shore up properly without removing the obelisk. The rose looks fairly old to me, the stem (trunk?!) at the bottom must be nearly 3 inches thick, and it's happily reaching a good few feet out of the top of the obelisk. I guess it's not been pruned in a while! The rose hasn't been trained around the obelisk, just up it, so they're not as entwined as they could be.
So, my question - should I prune enough to get the obelisk off - realistically cut it back 3 or 4 stems at 3ft, or go for the drastic cut at 8 inches from the soil and hope it gets the hint at throwing up some new shoots? What are people's thoughts?