Sorry to tell you but it's stupid to create a new post for the same problem.
After analysis and research, if I understood correctly, what you want is to use the ROG PHone 5 + Kunai 3 + Aerocooler 6 (like the picture below but with the new fan)
So you will need ROG Kunai 3 Bumper for ROG Phone 5 with Aerocooler 6
This does not exist and will never exist, for the good reason that the operation is impossible, the designers of the Aerocooler 6 who are "Censored" have limited the USB port to the only charging function, the joint operation of Aerocooler 6 and Kunai 3 via USB is therefore impossible.
Don't change your phone for a ROG 6 because it's identical, you have to choose between playing in USB with the Aeroccoli 6 or with the Kunai 3
In addition, ROG Kunai 3 Bumper for ROG Phone 6 does not exist, an owner of ROG 5 and Kunai 3 is obliged to buy a new Kunai 3 if he wants a ROG 6 and he cannot use it with the fan.
It's so huge that we could think of a bad joke, unfortunately it's the current reality.
Do like me, don't buy anything from ASUS anymore and wait for the new Xperia 1 IV 8 Gen 2 with its gaming accessory.