Back (way back) in my 30's I took a fall off a ladder and smashed my left wrist. A week after I fell, with a full arm plaster cast I was fishing with my brother on his boat. The fingers on my hand were purple, yellow and red from the fractures. I couldn't operate the reel handle or even begin to think about holding a rod in my opposite hand.
So, my brother and I zip died a small piece of aluminum channel across the palm of my cast. I'd jamb the reel handle in the channel and move the rod in circles around it to retrieve a fish. It was weird feeling, but I was fishing. Can't say it was comfortable either.
Anyhow, sorry about your shoulder. I'd wager that You'll be fishing by July.
Rg