I would suggest throwing in some overhead pressing to balance out the shoulder strength. The planche is basically a 'super' bench press. The bench press hits the anterior portion of the shoulder. Mark Rippetoes starting strength book suggest balancing bench pressing & overhead pressing every other workout to avoid strength imbalances..i.e shoulder pain.
I follow this approach with my gymnastics training and have experiancedlittle to no shoulder pain. Hope this helps.