My second grey, Barko, suffered from a partially paralyzed layrnex. It was a long time ago and Barko has long since gone to the bridge, so unfortunally I don't remember the particulars, but we did opt for surgery. Barko was probably 9 (we adopted him when he was 8). His surgery was done at the University of Wisconsin. We were very pleased with the outcome. Barko recovered quickly and was a different dog afterward.....much more loving and sociable. Barko died from cancer at almost 13 -- nothing to do with the layrnex.
I wish you the best with Roo. Decisions are sometimes hard to make. Hugs to both of you.