Thanks very much!!
I noticed that
OW Visit North America isn't there.
Since this includes the ability for non-US residents (since I live in Saudi I presume that would include me) to travel to various locations in US - I bet that I could tack on that HNL-DFW-HNL leg using a Visit North America addition to the ticket. According to what I see on the OW link above, this might work.
...assuming that I legitimately get to (via the RTW) or a separate ticket, HNL.
Or am I missing something?