Help! I'm down to the "wire" again and trying to set up a RTW so desperately need your help.

We're using the RTW to do a little traveling before and after a trip to the US - and to get segments in the US for "free". I'll be in school in the US near IND during the majority of the US time. Parameters are we want to go to HKG and to HNL, in D class minimum. We have a window of time from departing BAH on 5 July till 10 July for travel and then at end of trip from 14-17 Aug. Though we live Saudi, can depart BAH or cheaper alternate locations. On its face anyway, BAH is too expensive to use for RTW. Adding in the costs of getting to the other airports may drive the costs up to being the same thing, however.

My problems: I want to originate the RTW external to Saudi or BAH due to cost, and I have limited travel time available due to personal commitments in the US. I know the issues re HNL and will have to add on segments (maybe) or do it via GLOBxx instead of DOWEx. I don't think we have time in our travel schedule for the QF flight HNL-SYD to come back through Asia that way. I also want to be able to buy extra segments HNL-DFW-HNL (in D as part of the RTW) for a trip I have to take during the middle of this.

I’m currently looking at CAI, because it is the closest and the cheapest to get to. But it offers very limited options: CAI (so far as I can tell) only flies OW to LHR. If that's true, and I originate the RTW ex-CAI, wouldn't it be logical then that I could fly CAI-LHR-HKG on the outbound flight, and something like LAX-LHR-CAI on the inbound flight?

My ideas so far:
CAI-LHR-HKG-LAX-HNL-LAX-JFK-MAD-LHR-CAI
Great Circle Mapper shows this as 29599 mi.

My questions are:
- is the ex-CAI to LHR then Asia, and US to LHR-CAI routing permissible during such a trip.
- is such a trip ok under the GLOBxx as I've never done one of those and how much would an idea of what this might cost (USD)
- are there are other alternatives (ex-CAI)

Thanks in advance!