I stumbled upon this promotion earlier today very miraculously elsewhere and then was very happy to find a 19 page thread here!
I have yet to optimize it (will plan on doing over the next couple of days), but this is a rough draft I have.
Plan to start and end in China, and I semi-purposely made a detour to Vancouver on my North American tour to visit some friends.

Mon Sept 22 0650 CAN-ALA 1025 Air Astana KC188, 6 hr 25 min layover - $285
Mon Sept 22 1650 ALA-IST 2055 Air Astana KC911, 3 nights in Istanbul - $0
Thurs Sept 25 1940 IST-GRU 0300+1 Turkish Airlines TK 215, 7 days in Sao Paulo - $1191 SOUTH AMERICA
Fri Oct 3 0410 GRU-IST 2255 Turkish Airlines TK 16, 3 hours in Istanbul - $0
Sat Oct 4 0200 IST-CAI 0420 Turkish Airlines TK 692, 1 day in Cairo - $201 AFRICA
Sun Oct 5 0430 CAI-SAW 0640 AJet VF 248 - $102, change airports
Sun Oct 5 1900 IST-AUH 0035+1 Turkish Airlines TK 868, 1 day in Abu Dhabi - $122 ASIA
Tues Oct 7 0500 AUH-SAW 0845 Pegasus PC 407 - $101, 1 day in Istanbul
Wed Oct 8 1440 IST-YUL 1750 Turkish Airlines TK 35. 2 nights in Montreal - $345 NORTH AMERICA
Fri Oct 10 0810 YUL-YVR 1053 Westjet WS 589, 9 days in Vancouver - $106
Sun Oct 19 0745 YVR-LAX 1045 Flair F8 1888 - $76
Sun Oct 19 2125 LAX-CDG 1700+1 Norse Atlantic Airways N0 312, 5 nights in Paris - $141
Fri Oct 24 0720 CDG-IST 1200 Turkish Airlines TK 1830 - $216 EUROPE
Fri Oct 24 1645 IST-MEL 2025+1 Turkish Airlines TK 168, 2 nights in Melbourne - $651 OCEANIA
Mon Oct 27 0700 MEL-KUL 1215 AirAsia X D7 219, 6 hr 35 min layover - $211
Mon Oct 27 1850 KUL-PVG 0020+1 AirAsia X D7 330 - $0

Total $3,478 USD for flights

Any comments or suggestions to optimize?