dip would tax a lot on his wrist as well.
most presses involves wrist work.
wat i would suggest is he train his legs for now and maybe some pulling activity. example barbell rows, lat pulldowns or chinups. minimize the wrist rotation.
avoid those activities involving pushing heavy things.
barbell bench press or shoulder press etc.

dumbell rows lor...
shrugs? hmmm upright rows.
well, i think he could try chin up instead of pull ups.
chin up i think less taxing to the wrist. as for me la. =.=
he can do some light wrist work to strengthen his wrist.