Are you stopping in HKG? If not, may be you could max UA segments by doing:
ORD-NRT 6294
NRT-BKK 2849
Total 9143

instead of

ORD-HKG 7782
HKG-BKK 1063 (TG segment)
Total 8845

Using up your last 300 mileage allowance, but you are gaining at least 2500 HON status miles.

Note: my mileage info is from OAG which usually overestimate when planning RTW.