This is the trip we made, well actually three times, first time the sea was flat, no wind and it was a breeze. Second time we had 4bft and waves about 1m with long interval, the 15hp struggles when "climbing" the wave. But most important: we never felt unsafe, the Aerotec is a great little boat !
We launched the boat from Port de La Capte, normally its for residents only and you have to pay for at least one night. The "Capitainerie" was very friendly and he let us launch the boat for free !
Ps: it's not very common and sometimes even forbidden to beach launch. Look for a "Cale de mise a l'eau". Marines de Cogolin is a good one (9 euro, parking included). Good place to start your trip to St Tropez, Port Grimaud and St Maxime. Most Capitainerie's need to see your ICC and Insurance.