The corners I would choose if I was making such a circuit from the current 19 races would be:
AUSTRALIA - Turns 11 and 12, including the bendy straight leading up to it.
MALAYSIA - Turns 1 and 2
CHINA - The 'S' of turns 7 and 8
BAHRAIN - Turn 4
SPAIN - Turn 3
MONACO - Piscine II
CANADA - The hairpin and the straight leading up to the WoC
AUSTRIA - Remus (Turn 2)
GREAT BRITAIN - Maggots/Becketts
HUNGARY - The final hairpin
BELGIUM - Eau Rouge and Raidillon
MONZA - Parabolica and the start/finish straight
SINGAPORE - Turns 5, 6 and 7
SUZUKA - The Degners
RUSSIA - The Medal Plaza turn
UNITED STATES - Turns 1, 2 and 3
MEXICO - The second half of Peralta
BRAZIL - The run from Juncao to the finish line
ABU DHABI - Turns 10 and 11
FORMER F1 WILDCARD - Istanbul Turn 8