I did not have a scaphoid injury, but I did have a triangular fibrocartilage complex repair, which was on the other side of the wrist (pinky side). I still cannot do barbell curls or chin up on a straight bar due to reduce range of motion in my wrist. However, for some time I could not even do a push-up without pain, but over time I've stretched my wrist enough to where I can do heavy front squats and cleans without any problem. So, I was able to regain all of my wrist ROM in the flexion and extension range, but lost a little pronation/supination (still regained a ton though). Not sure if that is specific to my injury over yours... but I would really take the stretching and mobility stuff seriously, as you can regain A LOT of ROM by just taking that real serious on a daily basis. At least that has been my experience.
As far as power moves, if you can't clean, try doing power snatches. Those are killer and will have a similar training effect. Less weight used, but your exploding that weight over a greater distance. Those shouldn't bother your wrist, and if they do, get some quality wrist wraps and you should be good to go. Also, you can perform those from the hang as well.