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Even if you had any clogs, the grub screw mounted heatsinks can be more easily removed, without risking to unscrew the heatbreak from the nozzle.
Works with a 50x50x10 fan (2,4W) so far and no specifically designed fan shroud.
So if anybody is thinking about a 5in1out hotend, this might be a good start.
I tried with direct drives at first (see attached pic, don't get fooled by the printing time, eeprom was deleted inbetween)
Second pic shows the bowden setup, which is easier to work with and requires no adapters.
direct800.jpg bowden-setupt.PNG