Is this valid? LONE4 or DONE4

1: SAN-STL: 1st of 6 (North America) [24 hr]
2: STL-DFW: 2nd of 6 (North America) [stopover]
3: DFW-NRT: intercontinental
4: NRT-HKG: 1st of 4 (Asia)
5: HKG-BKK: 2nd of 4 (Asia)
6: BKK-SYD: intercontinental
7: SYD-CHC: 1st of 4 (Southwest Pacific)
8: CHC-AKL: 2nd of 4 (Southwest Pacific)
9: AKL-BNE: 3rd of 4 (Southwest Pacific)
10: BNE-SYD: 4th of 4 (Southwest Pacific)
11: SYD-LHR: intercontinental [going thorugh ASIA again]

Buy a LHR-USA-LHR ticket here for rest in USA

12: LHR-TLV: 1st of 4 (Europe)
13: TLV-MAD: 2nd of 4 (Europe)
14: MAD-ATH: 3rd of 4 (Europe) [Going to TLV and ATH]
15: ATH-LHR: 4th of 4 (Europe)
16: LHR-DFW: intercontinental [stop over]
17: DFW-STL: 3rd of 6 (North America) [24 hr]
18: STL-SAN: 4th of 6 (North America)
Congratulations!! Valid itinerary!!! - (44614 miles)

Potential problems:
24 hour stopovers in STL
Going through Asia twice
Going to TLV and ATH
Buying a ticket LHR-USA-LHR...I don't think rest violates any of the rules

Any suggestions?