I've found it a lot easier transplanting large roses since I started thinking of them as like new bare root plants. You won't be able to get a decent root ball, so I'd say don't even try. Get as much fleshy root as you can. I would cut back the canes to a manageable size (2'-4') and strip all the foliage to reduce moisture loss. Then spray the canes with Wilt Pruf or another antitranspirant. With this treatment, you don't have to worry about providing shade or having the plants wilt themselves to death. They will grow out in a few weeks after fine roots have established themselves in the soil. There are other approaches that may or may not produce a large plant sooner.

I think Paul Zimmerman has a great video about transplanting roses.

Here is a link that might be useful: Moving roses video

Thanks all!

Hey thanks so much for this, attempting to move 2 drouhins next month! 🤞