Just a follow up to help others in the future.
Had a full general anesthetic and was home that night after the surgery to repair the hydrocele. Off work for about five days in total. My AME just wanted the report from before and after and that was that. And at my Class 1 renewal recently; it wasn't even brought up in conversation. So very much a non-event.
Also, for info; it is pretty much a non-issue in China as well...