If you have wrist issues, just accept that you won't be able to do a slap save with the same oomf as someone without wrist issues. Make up for it by being a more tactical shooter that plays in control and doesn't let the ball get out of their control.
Quoted from ForceFlow:Wrist braces?
They would cut down the potential damage to your wrists, but unfortunately are awful to play in. I tried that myself once, but I could never get a good feeling for the game because of the angle of your wrist ends up being straight.