In reply to Alex Buisse:
Thanks for the advice, Alexandre!
We were there last weekend, and climbed the Swiss Route on Grand Capucin. The schrund and the Couloir des Aguilettes were in perfect nick, and also the route was in good condition and dry. That's at least what I thought on the way up. However, when we were abseiling, there was already a waterfall over all the upper pitches. So it is key to start early and be quick.
From below and on early morning, the Bonatti seemed good as well. However, because it gets sun much earlier, problems with runoff might start much earlier. Also, it is only accessible directly from below, the access via the ledges looked like having a portion of advanced mixed climbing.