I'm flying CDG-JNB on AF #990, scheduled to arrive at 09:50. I'd like to connect to BA (Comair) #6291, JNB-LVI, departing 11:00 the same day. I'll be arriving in business class and will only have carry-on bags (no checked luggage). The two tickets will be on separate PNRs. I understand that the international-to-international minimum connection time at JNB is 60 minutes. Is the 1:10 connection time doable/realistic?

Also, in the unfortunate event that I misconnect, there is an 11:25 flight on BA (Comair) #6285 from JNB-VFA. While I'd rather not fly to VFA (to avoid the Zimbabwe visa fee), if a delayed arrival of AF #990 causes me to miss the LVI flight, but leaves me with time to catch the 25-minute later departure to VFA, any chance BA would put me on the VFA flight?