what are your dates of interest?
I can tell you that, having nonrev'd several times on S2's, it can be more than challenging! Do you have options for zed fares to get to CDG or AMS on partners?
Whatever you do, don't make non-refundable/changeable reservations--you will need ultimate flexibility. I've been thru JNB and it's also a seasonal challenge.
I'll be happy to assist w/anything for last minute res idea, too.