there is also a NBO-(LUNx)-HRE on TUE.
alternative, if you reverse the direction of travel, you will stay overnight at NBO (her-nbo-sez) but that is not a stopover since it is <24 hours

i am thinking of taking the acc/los option but not sure how to get there economically and safely. i prefer this way because
1. i can do ZA-los/acc-lhr(x)-americas-asia-europe-ZA, and i don't have to hurry through europe trip before going to the americas(more evenly split of the journey as i am based in HKG now)
2. i can stop by LHR twice (a bit more miles as well), i.e. no need to take the hkg-jnb option