The wrist problem can be resolved my exercising your wrists. Get a small weight, not too heavy, start with a short piece of pipe or something similar. You're not trying to build muscles in your wrist, you're trying to build wrist flexibility.
Hold arms straight out in front of you keeping your arms straight with your palms up and thumbs out. Curl your wrist up as far as you can and hold for a few seconds. Then slowly uncurl your wrist and let you hands open allowing the pipe to roll down into your fingers forcing a little stretching at the wrist. Do this several times. Then grasp the pipe with the pipe vertical and palms inside with thumbs up and raise and lower your wrist while keeping your arms straight. Do this several times. Then still holding the pipe in front of you and arms straight, rotate your wrist first clockwise and then counter-clockwise. Then the left clockwise and the right counter-countwise. Then reverse the direction with the left counter-clock wise and the right clockwise. Do this a few times before playing and you will find it you will not no longer have stiff wrists. They may be a little sore until you get use to it, but you won't have a stiff wrist. Don't increase the weights. As it gets easilier, do more reps.
Good Luck!