I'm trying to build a complicated RTW itinerary and despite reading the stickies and using the websites suggested I am having trouble.

I want to start in CAI since that is cheapest, and then travel to the following places in this order:

JFK
GIG
LHR
CPT
LHR
TLV

I have been wrestling with the one-checker itinerary website, but I can't add in the CPT leg because it tells me I can't do more than one "Ghana/Nigeria" transit. Does this mean that once I've entered Africa from Europe I can't then return to Europe?

How do I square this with the other requirements of the ticket -- ie visiting my list of places in the order I gave? I could see how you might have to add a leg such as CPT-JNB-SYD to the ticket if you can't reenter Europe, butI don't want to do that since I have to return to LHR and then go to TLV afterwards.

I don't really care what other intermediate points I add in between the cities given above (in fact I'd like to add as many as possible to maximise my miles) but I can't see how to solve the problem.

I also don't mind also replacing an LHR stop with MAD/DUB etc -- iea European destination from which I can easily return to LHR on a separate ticket -- if there are too many LHR stops here.

Any experienced RTW ticketers able to help me form a valid itinerary?

Thanks.