I used a method very similar to yours Steve!
I don't have a vice but used a g clamp Like cib0rgman, with a nylon die behind the watch, then used a section of plumbing adapter, filed wider to sit over the retaining ring then gently tightened the clamp, winding back and rotating as necessary.
Thanks for your help.
Only problem was after the first time I did it a white spec appeared on the dial out of nowhere and I had to remove it and do it all again! Joy.