Yes, you are correct; the more the better. This is actually one of the functions on noonsite; it collects yachts for convoys if you think you need it. Another good source are the liveaboard cruising communities along the Turkish south coast which is a very popular starting point for a journey like this. I know of at least one boat in the Marmaris Bay that might be doing this at about the same time and doubtless we will find more closer to cast off time.

However, after having read the data I now think these convoys have much more of a social function than that they are needed for security.