Something like this?
http://www.crazyguyonabike.com/doc/page/pic/?pic_id=1455644
This is a semi-serious suggestion. I had a bit of an off a month or so before a tour a couple of years ago. I wasn't hurt anything like as badly as Mrs RM, but my shoulder still wasn't quite right when the time came, so we took our recumbents on the trip - no shoulder strength necessary. In fact, our trip took us up the North Sea Coast Route and into Denmark - and that flat country is perfect for recumbents. In the circumstances, we might make our tandem available to you RM.
I wish I'd had a recumbent years ago when I smashed a wrist (on an ice rink). It was over a year before I was anything like comfortable on a regular bike again.